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Colorado State University is one of our nation's leading research universities with world-class research in infectious disease, atmospheric science, clean energy technologies, and environmental science. It was founded in 1870 as the Colorado Agricultural College, six years before the Colorado Territory became a state. Colorado State University, located in Fort Collins, Colorado, is situated on nearly 5,000 acres of land, including the main campus, a foothills campus, an agricultural campus, and a mountain campus (Pingree Park). Colorado State also has 4,600 acres for research centers, Cooperative Extension offices, and Colorado State Forest Service stations. |
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| 696 Images of 168 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5495198 | willow scale | Diaspidiotus gigas | Scale on aspen bark |
| 5495199 | willow scale | Diaspidiotus gigas | |
| 5495200 | willow scale | Diaspidiotus gigas | Scale on aspen bark |
| 5495201 | willow scale | Diaspidiotus gigas | Willow scale crawler |
| 5495202 | willow scale | Diaspidiotus gigas | |
| 5495193 | phylloxera | Phylloxera popularia | Collected from Populus tremuloides. Crawler |
| 5495263 | long-horned beetle | Neoclytus spp. | |
| 5495266 | cicadas | Flagging damage to Gamble Oak | |
| 5495195 | willow scale | Diaspidiotus gigas | Scales on aspen bark |
| 5495196 | phylloxera | Phylloxera popularia | |
| 5490392 | hawthorn mealybug | Phenacoccus dearnessi | Honeydew produced by heavy infestation of hawthorn mealybug |
| 5490388 | hawthorn mealybug | Phenacoccus dearnessi | Fully developed females on twigs |
| 5490389 | hawthorn mealybug | Phenacoccus dearnessi | Fully developed females on twigs |
| 5490390 | hawthorn mealybug | Phenacoccus dearnessi | Late instar nymphs that have collected under tape on tree |
| 5490391 | hawthorn mealybug | Phenacoccus dearnessi | |
| 5490393 | European elm scale | Eriococcus spuria | late instar females |
| 5490394 | European elm scale | Eriococcus spuria | full grown females and cocoons produced by males |
| 5490395 | European elm scale | Eriococcus spuria | Adults females packed into bark cracks. |
| 5490397 | European elm scale | Eriococcus spuria | |
| 5490313 | hackberry lace bug | Corythucha celtidis | Adult, nymphs and nymphal skins |
| 5490314 | hackberry lace bug | Corythucha celtidis | Adults, nymphs and nymphal skins |
| 5490315 | hackberry lace bug | Corythucha celtidis | injury on upper leaf surface |
| 5490398 | European elm scale | Eriococcus spuria | Male attempting to mate with female |
| 5490399 | European elm scale | Eriococcus spuria | Late instar. Some mummies resultign from parasitism are evident |
| 5490319 | Thousand Cankers Disease | Geosmithia morbida | Beginning of tree removal for black walnut killed by thousand cankers disease |
| 5490320 | walnut husk fly | Rhagoletis completa | Larval damage to husk of black walnut |
| 5490321 | walnut husk fly | Rhagoletis completa | Larval damage to husk of black walnut |
| 5488738 | kauri | Agathis australis | Young tree open grown |
| 5488741 | kauri | Agathis australis | Developing cone |
| 5488735 | kauri | Agathis australis | |
| 5488736 | kauri | Agathis australis | twin kauri trees |
| 5488737 | kauri | Agathis australis | |
| 5488744 | kauri | Agathis australis | Bronze foliage, a common feature of very young kauri |
| 5488745 | kauri | Agathis australis | Seedling growth on rotten trunk |
| 5488746 | kauri | Agathis australis | |
| 5488747 | kauri | Agathis australis | Top view of kauri crown |
| 5488742 | kauri | Agathis australis | |
| 5488743 | kauri | Agathis australis | developing cones |
| 5488757 | kauri | Agathis australis | trunk |
| 5488759 | kauri | Agathis australis | |
| 5488760 | kauri | Agathis australis | |
| 5488761 | kauri | Agathis australis | |
| 5488762 | kauri | Agathis australis | |
| 5488763 | kauri | Agathis australis | |
| 5490322 | walnut husk fly | Rhagoletis completa | Late instar larva |
| 5490335 | brown mite | Bryobia rubrioculus | Egg masses at twig crotch of aspen |
| 5488883 | brown soft scale | Coccus hesperidum | Adults and nymphs. some evidence of parasitism is present |
| 5488885 | brown soft scale | Coccus hesperidum | Adults and nymphs. Some evidence of parasitism is present |
| 5488886 | brown soft scale | Coccus hesperidum | Soft brown scale and associated sooty mold |
| 5488887 | brown soft scale | Coccus hesperidum | Sooty mold developing on holly that was heavily infested with soft brown scale. |
| 5488888 | sooty beech scale | Ultracoelostoma assimile | Sooty mold covering black beech. The honeydew is excreted by the sooty beech scasle via tubes that penetrate the sooty mold crust. |
| 5488889 | sooty beech scale | Ultracoelostoma assimile | Sooty mold covering black beech. The honeydew is excreted by the sooty beech scale via tubes that pentrate the sooty mold crust. |
| 5490345 | boxelder gall midge | Contarinia negundinis | |
| 5490346 | boxelder gall midge | Contarinia negundinis | |
| 5490351 | poplar twiggall fly | Hexomyza schineri | Larva exposed in gall |
| 5490366 | golden oak scale | Asterolecanium variolosum | |
| 5490377 | European alder leafminer | Fenusa dohrnii | leaf mine |
| 5490381 | hawthorn leafminer | Profenusa canadensis | leaf mine |
| 5490382 | hawthorn leafminer | Profenusa canadensis | leaf mine |
| 5490384 | boxelder gall midge | Contarinia negundinis | Larvae exposed in gall. A parasitoid egg is in the upper left. |
| 5490380 | hawthorn leafminer | Profenusa canadensis | leaf mine |
| 5488786 | fall webworm | Hyphantria cunea | Heavily infested walnut along roadside |
| 5488801 | Northern California walnut | Juglans hindsii | |
| 5488803 | bronzed cutworm | Nephelodes minians | |
| 5488804 | boxelder bug | Boisea trivittata | |
| 5488805 | boxelder bug | Boisea trivittata | Nymphs developing on seeds of bigtoothed maple |
| 5488806 | boxelder bug | Boisea trivittata | |
| 5488812 | Northern California walnut | Juglans hindsii | |
| 5488817 | Northern California walnut | Juglans hindsii | trunk |
| 5488813 | breadfruit | Artocarpus altilis | |
| 5488811 | breadfruit | Artocarpus altilis | |
| 5489869 | cork oak | Quercus suber | Bark of cork tree. The area in the lower half of the image was previously harvested. |
| 5489870 | cork oak | Quercus suber | |
| 5490216 | Thousand Cankers Disease | Geosmithia morbida | Canker produced by Geosmithia morbida around gallery of walnut twig beetle in southern California walnut |
| 5490217 | walnut twig beetle | Pityophthorus juglandis | Sachet containing lure (Compound X) attractive to walnut twig beetle |
| 5490231 | Egyptian Thorn | Acacia nilotica | |
| 5490232 | Egyptian Thorn | Acacia nilotica | |
| 5490233 | Egyptian Thorn | Acacia nilotica | |
| 5490234 | Egyptian Thorn | Acacia nilotica | |
| 5490235 | Egyptian Thorn | Acacia nilotica | |
| 5490236 | Egyptian Thorn | Acacia nilotica | |
| 5490238 | Egyptian Thorn | Acacia nilotica | |
| 5490239 | Egyptian Thorn | Acacia nilotica | |
| 5488814 | breadfruit | Artocarpus altilis | |
| 5488815 | breadfruit | Artocarpus altilis | |
| 5488816 | breadfruit | Artocarpus altilis | |
| 5443148 | European alder leafminer | Fenusa dohrnii | Blotch mines produced by leafminer |
| 5083023 | oak rough bulletgall wasp | Disholcaspis quercusmamma | a few of the galls in the center show emergence holes. Galls are at the time of adult emergence (November 3, 2006). |
| 5302066 | bronze birch borer | Agrilus anxius | Exit hole (D-shaped, typical of Agrilus spp.) |
| 5445262 | mealy plum aphid | Hyalopterus pruni | |
| 5445196 | imported willow leaf beetle | Plagiodera versicolora | |
| 5024084 | walnut twig beetle | Pityophthorus juglandis | Adult galleries and associated Geosmithia morbida infection in a ca. 10 cm. diameter branch. |
| 1455179 | fall webworm | Hyphantria cunea | Tent |
| 5445325 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Colony exposed within curled ash leaf |
| 5445324 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Colony exposed within curled ash leaf |
| 5445322 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Colony exposed within curled ash leaf |
| 5445294 | walnut twig beetle | Pityophthorus juglandis | Host: black walnut Adults on penny showing relative to size |
| 5445293 | walnut twig beetle | Pityophthorus juglandis | Adults on penny showing relative size Host: black walnut |
| 5445258 | great ash sphinx | Sphinx chersis | larva was collected from Grand Junction, Colorado |
| 1325017 | pin oak kermes | Allokermes galliformis | mature females on pin oak |
| 1325018 | pin oak kermes | Allokermes galliformis | nymphs around bark scale on pin oak |
| 1243078 | pin oak kermes | Allokermes galliformis | Eggs at hatch on Pin oak. |
| 5445211 | boxelder psyllid | Cacopsylla negundinis | |
| 1326120 | pin oak kermes | Allokermes galliformis | Dead twigs typical of injury |
| 1476113 | pin oak kermes | Allokermes galliformis | Kermes scale and assocaited sticky ooze |
| 1476114 | pin oak kermes | Allokermes galliformis | |
| 5445191 | cherry curculio | Anthonomus consors | Fruit punctures made during oviposition |
| 5445190 | cherry curculio | Anthonomus consors | |
| 5445187 | cherry curculio | Anthonomus consors | late stage larvae exposed within seed pit |
| 5445188 | cherry curculio | Anthonomus consors | Late stage larvae exposed within seed pit |
| 5445129 | locust borer | Megacyllene robiniae | Sawdust piled at base of locust borer infested tree |
| 5445366 | great ash sphinx | Sphinx chersis | |
| 5445354 | ash plant bug | Tropidosteptes amoenus | |
| 5445320 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Leafcurling of new foliage of green ash |
| 5445321 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Colony exposed within curled ash leaf |
| 5445374 | poplar vagabond aphid | Mordvilkoja vagabunda | Large pseudo-gall produced on aspen terminal |
| 5445369 | two-tailed tiger swallowtail | Papilio multicaudata | chrysalid |
| 5445367 | two-tailed tiger swallowtail | Papilio multicaudata | Early stage larva |
| 5445305 | two-tailed tiger swallowtail | Papilio multicaudata | |
| 5445304 | two-tailed tiger swallowtail | Papilio multicaudata | |
| 5445259 | great ash sphinx | Sphinx chersis | Frass produced by full grown larva |
| 5445257 | great ash sphinx | Sphinx chersis | Full grown larva feeding on ash |
| 5445176 | colorado hairstreak | Hypaurotis crysalus | |
| 5445195 | imported willow leaf beetle | Plagiodera versicolora | Larvae and associated skeletonizing injury |
| 5445193 | imported willow leaf beetle | Plagiodera versicolora | |
| 5445194 | imported willow leaf beetle | Plagiodera versicolora | |
| 5445192 | imported willow leaf beetle | Plagiodera versicolora | |
| 5445132 | locust borer | Megacyllene robiniae | Teneral adult within tunnel of black locust |
| 5445130 | locust borer | Megacyllene robiniae | Late instar larvae within tunnels of black locust |
| 5445131 | locust borer | Megacyllene robiniae | Teneral adults within tunnels of black locust |
| 1476047 | mountain-ash sawfly | Pristiphora geniculata | Larvae |
| 1476046 | mountain-ash sawfly | Pristiphora geniculata | Larvae |
| 5443283 | poplar twiggall fly | Hexomyza schineri | Developing gall. Photograph taken June 20, 2010. |
| 5443287 | elm leaf beetle | Xanthogaleruca luteola | Pupae at base of infested elm |
| 5443288 | elm leaf beetle | Xanthogaleruca luteola | Pupae at base of infested elm |
| 5443289 | elm leaf beetle | Xanthogaleruca luteola | Skeletonizing damage produced by elm leaf beetle larvae |
| 5443270 | European elm flea weevil | Orchestes alni | Larva exposed in leaf mine |
| 5443271 | European elm flea weevil | Orchestes alni | Larva exposed in leaf mine |
| 5443272 | European elm flea weevil | Orchestes alni | Pupa exposed in leaf mine |
| 5443281 | poplar twiggall fly | Hexomyza schineri | |
| 5443282 | poplar twiggall fly | Hexomyza schineri | |
| 5443260 | honeylocust pod gall midge | Dasineura gleditchiae | Ovipositing |
| 5443261 | honeylocust pod gall midge | Dasineura gleditchiae | Pod galls on honeylocust |
| 5443262 | honeylocust pod gall midge | Dasineura gleditchiae | Pod galls |
| 5443263 | honeylocust pod gall midge | Dasineura gleditchiae | |
| 5443264 | honeylocust pod gall midge | Dasineura gleditchiae | Pod galls |
| 5443265 | European elm flea weevil | Orchestes alni | Adult and associated shothole damage |
| 5443266 | European elm flea weevil | Orchestes alni | Adults and associated shothole damage |
| 5443267 | European elm flea weevil | Orchestes alni | Adults and leaf mine produced by larval stage |
| 5443268 | European elm flea weevil | Orchestes alni | |
| 5443214 | European alder leafminer | Fenusa dohrnii | Blotch mines produced by leafminer |
| 5443194 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Adult female on twiggall. Photograph taken November 5, 2011 |
| 5443195 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Adult female on twiggall. Photograph taken on November 5, 2010 |
| 1455152 | forest tent caterpillar | Malacosoma disstria | Mass of larvae on trunk |
| 1326070 | cottonwood leaf beetle | Chrysomela scripta | Older instar larvae |
| 1243079 | scurfy scale | Chionaspis furfura | Old scales and crawlers on Aspen. |
| 1243084 | variable oakleaf caterpillar | Lochmaeus manteo | Full grown Larva. |
| 5432751 | carpenterworm | Prionoxystus robiniae | |
| 5432754 | carpenterworm | Prionoxystus robiniae | |
| 5432755 | carpenterworm | Prionoxystus robiniae | |
| 5432756 | carpenterworm | Prionoxystus robiniae | |
| 5432757 | linden looper | Erannis tiliaria | |
| 5432758 | linden looper | Erannis tiliaria | |
| 5432759 | linden looper | Erannis tiliaria | |
| 5432760 | linden looper | Erannis tiliaria | |
| 5432752 | carpenterworm | Prionoxystus robiniae | |
| 5432753 | carpenterworm | Prionoxystus robiniae | |
| 5432750 | carpenterworm | Prionoxystus robiniae | |
| 5432761 | linden looper | Erannis tiliaria | |
| 5432762 | linden looper | Erannis tiliaria | |
| 5432763 | linden looper | Erannis tiliaria | |
| 5432764 | linden looper | Erannis tiliaria | |
| 1246043 | leaf blotch miners | Phyllonorycter spp. | Tentiform mines, view from underside of leaf |
| 1246037 | poplar-and-willow borer | Cryptorhynchus lapathi | |
| 1326204 | bronze birch borer | Agrilus anxius | on Birch. |
| 1326177 | big poplar sphinx | Pachysphinx occidentalis | |
| 1326174 | big poplar sphinx | Pachysphinx occidentalis | Adult with newly laid eggs. Found on Cottonwood, aspen, and willow. |
| 1326175 | big poplar sphinx | Pachysphinx occidentalis | Adult. Found on Cottonwood, aspen, and willow. |
| 1326067 | woolly beech aphid | Phyllaphis fagi | Colony on beech leaf |
| 1326035 | cottonwood twig borer | Gypsonoma haimbachiana | Broken twig at larval tunnel |
| 1326052 | hunting wasp | Pemphredon spp. | Recently emerged asult nesting in green ash twig |
| 1326010 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Fully formed galls on twig |
| 1325009 | sycamore lace bug | Corythucha ciliata | |
| 1326082 | chokecherry midge | Contarinia virginianae | Typical gall |
| 1326008 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Winged adult form |
| 1243081 | bronze birch borer | Agrilus anxius | Larval tunnels on birch. |
| 1326114 | European elm scale | Eriococcus spuria | Mature females |
| 1455173 | western tent caterpillar | Malacosoma californicum | |
| 1455170 | western tent caterpillar | Malacosoma californicum | At egg hatch |
| 1326003 | kermes scale | Allokermes gillettei | Crawlers exposed from female |
| 1326111 | European elm scale | Eriococcus spuria | Mature females and crawlers |
| 1476127 | Eriophyid mite | leaf edge curling symptom produced by eriophyid mites on aspen | |
| 1476105 | metalic wood-boring beetles | Agrilus quercicola | adult emerging from trunk |
| 1476106 | metalic wood-boring beetles | Agrilus quercicola | |
| 1326040 | leafcurl plum aphid | Brachycaudus helichrysi | Tight leafcurling typical of spring infestation |
| 1326009 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Developing galls on twig |
| 1326001 | kermes scale | Allokermes gillettei | Mature females |
| 1246060 | honeylocust plant bug | Diaphnocoris chlorionis | |
| 1246069 | elm leaf beetle | Xanthogaleruca luteola | Late stage |
| 1455168 | western tent caterpillar | Malacosoma californicum | On tent |
| 1246047 | birch leafminer | Fenusa pusilla | |
| 1455040 | poplar blackmine beetle | Zeugophora scutellaris | |
| 1246044 | leaf blotch miners | Phyllonorycter spp. | Tentiform mines, view from underside of leaf |
| 1326083 | chokecherry midge | Contarinia virginianae | Typical gall |
| 1326109 | European elm scale | Eriococcus spuria | colony of mature females at end of egg hatch (mid-July) |
| 1326116 | European elm scale | Eriococcus spuria | Nymphs along leaf veins and honeydew droplet |
| 1326106 | poplar twiggall fly | Hexomyza schineri | Tree showing effect of several years' infestation |
| 1326066 | elm leafminer | Kaliofenusa ulmi | Typical leafmine |
| 1326068 | honeylocust leafhopper | Macropsis fumipennis | |
| 1326056 | Eriophyid mite | Leaf folding induced by eriophyid mite, bottom | |
| 1326074 | cottonwood leaf beetle | Chrysomela scripta | |
| 1326034 | cottonwood twig borer | Gypsonoma haimbachiana | Larva in twig tunnel |
| 1326007 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Adult exposed from gall immediately prior to emergence |
| 1326092 | poplar twiggall fly | Hexomyza schineri | Pupa emerging from gall |
| 1326107 | poplar twiggall fly | Hexomyza schineri | cross section of old gall |
| 1326084 | chokecherry midge | Contarinia virginianae | Larvae exposed from gall |
| 1455022 | elm leafminer | Kaliofenusa ulmi | |
| 1326102 | poplar twiggall fly | Hexomyza schineri | Adult fly and primary parasitoid, the eurytomid Eurytoma contractura |
| 1455197 | grape mealybug | Pseudococcus maritimus | |
| 1455151 | forest tent caterpillar | Malacosoma disstria | Mass of larvae on trunk |
| 1455169 | western tent caterpillar | Malacosoma californicum | At egg hatch |
| 1455175 | western tent caterpillar | Malacosoma californicum | In old tent |
| 1455176 | eastern tent caterpillar | Malacosoma americanum | |
| 1246093 | viceroy | Limenitis archippus | |
| 1326011 | treehopper | Micrutalus calva | |
| 1455053 | poplar leaffolding sawfly | Phyllocolpa bozemani | Older larva |
| 1326207 | boxelder bug | Boisea trivittata | on Boxelder. |
| 1326110 | European elm scale | Eriococcus spuria | Nymphs on foliage |
| 1326069 | golden oak scale | Asterodiaspis variolosa | Colony on twig |
| 1326072 | cottonwood leaf beetle | Chrysomela scripta | Young larvae at egg hatch |
| 1326054 | Eriophyid mite | Leaf curl induced by eriophyid mite | |
| 1455115 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Typical leaf curling damage |
| 1246061 | elm leaf beetle | Xanthogaleruca luteola | at egg hatch |
| 1455001 | aspen leafminer | Phyllocnistis populiella | Within mine |
| 1246058 | honeylocust plant bug | Diaphnocoris chlorionis | |
| 1326073 | cottonwood leaf beetle | Chrysomela scripta | Older instar larvae |
| 1246049 | birch leafminer | Fenusa pusilla | |
| 1455050 | poplar leaffolding sawfly | Phyllocolpa bozemani | Young larva in leaf fold |
| 1455015 | European alder leafminer | Fenusa dohrnii | |
| 1326006 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Developing galls on twig |
| 1326091 | poplar twiggall fly | Hexomyza schineri | Larva exposed on gall |
| 1326105 | poplar twiggall fly | Hexomyza schineri | Adult sunning on leaf |
| 1246073 | elm leaf beetle | Xanthogaleruca luteola | Overwintered beetles in diapause coloration |
| 1455080 | pigeon tremex | Tremex columba | Female ovipositing |
| 1326115 | European elm scale | Eriococcus spuria | Nymphs along leaf veins |
| 1455158 | forest tent caterpillar | Malacosoma disstria | |
| 1243082 | bronze birch borer | Agrilus anxius | Larva on Birch. |
| 1455171 | western tent caterpillar | Malacosoma californicum | |
| 1326036 | cottonwood twig borer | Gypsonoma haimbachiana | Larva in twig tunnel |
| 1246038 | poplar-and-willow borer | Cryptorhynchus lapathi | |
| 1455185 | pigeon tremex | Tremex columba | Female ovipositing |
| 1326112 | European elm scale | Eriococcus spuria | Scale flagging typical of chronic infestation |
| 1326071 | cottonwood leaf beetle | Chrysomela scripta | Older instar larvae and typical damage |
| 1326108 | European elm scale | Eriococcus spuria | colony of mature females at egg hatch (mid-June) |
| 1246070 | stag beetle | Lucanus mazama | Male and female |
| 1246057 | honeylocust plant bug | Diaphnocoris chlorionis | shown with nymph on stem |
| 1246006 | bronze birch borer | Agrilus anxius | |
| 1246048 | birch leafminer | Fenusa pusilla | Exposed from leaf mine |
| 1455036 | leaf blotch miners | Phyllonorycter spp. | |
| 1326019 | apple flea beetle | Altica foliaceae | Damage to new growth |
| 1326004 | Cynipid gall wasp | Acraspis macrocarpae | agamic generation |
| 1246041 | elm leafminer | Kaliofenusa ulmi | Larval tunneling |
| 1455187 | pigeon tremex | Tremex columba | Typical spherical exit holes |
| 1455150 | forest tent caterpillar | Malacosoma disstria | Mass of larvae on trunk |
| 1455186 | pigeon tremex | Tremex columba | Female ovipositing |
| 1246050 | birch leafminer | Fenusa pusilla | Characteristic mining damage |
| 1455153 | forest tent caterpillar | Malacosoma disstria | |
| 1455154 | forest tent caterpillar | Malacosoma disstria | |
| 1455156 | forest tent caterpillar | Malacosoma disstria | |
| 1326075 | cottonwood leaf beetle | Chrysomela scripta | Mating pair |
| 1326002 | kermes scale | Allokermes gillettei | Crawlers exposed from female |
| 1246042 | elm leafminer | Kaliofenusa ulmi | Exposed from mine |
| 1455052 | poplar leaffolding sawfly | Phyllocolpa bozemani | Older larva |
| 1455002 | aspen leafminer | Phyllocnistis populiella | Within mine |
| 1455157 | forest tent caterpillar | Malacosoma disstria | |
| 1326090 | poplar twiggall fly | Hexomyza schineri | Early symptoms of twig galling |
| 1326096 | oak spittlebugs | Clastoptera spp. | Spittle mass and nymphs |
| 1246065 | elm leaf beetle | Xanthogaleruca luteola | |
| 1326093 | European alder leafminer | Fenusa dohrnii | Typical leafmines in Alder |
| 1455043 | uglynest caterpillar | Archips cerasivorana | With tent |
| 1455019 | elm leafminer | Kaliofenusa ulmi | Oviposition punctures in leaf |
| 1455190 | pigeon tremex | Tremex columba | Female ovipositing |
| 1455020 | elm leafminer | Kaliofenusa ulmi | Exposed from leaf mine |
| 5432154 | willow scale | Diaspidiotus gigas | Crawlers of willow scale escaping from female scale |
| 1455189 | pigeon tremex | Tremex columba | Female ovipositing |
| 1326095 | oak spittlebugs | Clastoptera spp. | Spittle mass and nymphs |
| 1325073 | western erineum mite | Phyllocoptes didelphis | erineum produced on Rocky Mountain maple |
| 1455155 | forest tent caterpillar | Malacosoma disstria | |
| 1455016 | birch leafminer | Fenusa pusilla | |
| 1455017 | elm leafminer | Kaliofenusa ulmi | |
| 1455018 | elm leafminer | Kaliofenusa ulmi | Oviposition punctures in elm leaf |
| 1455163 | southwestern tent caterpillar | Malacosoma incurvum | |
| 1246046 | birch leafminer | Fenusa pusilla | |
| 1326076 | cottonwood leaf beetle | Chrysomela scripta | Egg mass |
| 1246092 | viceroy | Limenitis archippus | chrysalis |
| 1455149 | forest tent caterpillar | Malacosoma disstria | Mass of larvae on trunk |
| 1455048 | cottonwood catkingall mite | Eriophyes neoessegi | Large gall produced from catkin |
| 1326104 | poplar twiggall fly | Hexomyza schineri | typical twiggalls |
| 1325016 | currant borer | Synanthedon tipuliformis | |
| 1455023 | locust leafminer | Odontota dorsalis | |
| 1455180 | fall webworm | Hyphantria cunea | |
| 1455044 | uglynest caterpillar | Archips cerasivorana | Tent |
| 1326098 | columbine leafminer | Phytomyza aquilegivora | Leafmines |
| 1326089 | hawthorn leafminer | Profenusa canadensis | Blotch leafmine typically produced |
| 1326101 | poplar twiggall fly | Hexomyza schineri | Symptoms shortly after oviposition |
| 1326087 | cherry curculio | Anthonomus consors | Adult feeding on fruit |
| 1325052 | honeylocust plant bug | Diaphnocoris chlorionis | Leaf twisting and chlorosis associated with feeding injuries |
| 1455177 | fall webworm | Hyphantria cunea | Tent |
| 1325066 | ash flower gall mite | Eriophyes fraxiniflora | |
| 1325005 | honeylocust spider mite | Platytetranychus multidigituli | bronzing of street tree planting |
| 1246094 | elm sphinx | Ceratomia amyntor | Full grown |
| 1326103 | poplar twiggall fly | Hexomyza schineri | typical twiggalls |
| 1325088 | poplar borer | Saperda calcarata | frass expelled by tunneling borer |
| 5369760 | tussock moths | Comparison of gypsy moth (Lymantria dispar) and douglas-fir tussock moth (Orygia pseudotsugata) | |
| 1326005 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Fully formed galls on twig |
| 1476076 | hackberry nipplegall maker | Pachypsylla celtidismamma | Late instar nymph exposed within gall |
| 1476077 | hackberry nipplegall maker | Pachypsylla celtidismamma | late instar nymph exposed with gall |
| 1476078 | hackberry nipplegall maker | Pachypsylla celtidismamma | newly emerged adult next to gall |
| 1476079 | hackberry nipplegall maker | Pachypsylla celtidismamma | newly emerged adult next to gall |
| 1476084 | boxelder aphid | Periphyllus negundinis | |
| 1476085 | elm leaf aphid | Tinocallis ulmifolii | nymph of an alate form with wing pads |
| 1476086 | elm leaf aphid | Tinocallis ulmifolii | |
| 1476088 | poplar twig gall aphid | Pemphigus populiramulorum | gall produced on cottonwood twig |
| 1476090 | lettuce root aphid | Pemphigus bursarius | gall produced on popular petiole |
| 1476093 | European alder leafminer | Fenusa dohrnii | leaf mines |
| 1476094 | birch leafminer | Fenusa pusilla | leaf mines |
| 1476095 | birch leafminer | Fenusa pusilla | leaf mines |
| 1476096 | pear sawfly | Caliroa cerasi | early instar larvae near hatched egg |
| 1476097 | pear sawfly | Caliroa cerasi | |
| 1476100 | oak phylloxerids | Phylloxera spp. | large colony on aspen |
| 1476104 | poplar borer | Saperda calcarata | Sawdust frass expelled from tunnel |
| 1476109 | oak rough bulletgall wasp | Disholcaspis quercusmamma | gall cut away to show pupal chamber |
| 1476110 | oak rough bulletgall wasp | Disholcaspis quercusmamma | pupal covering |
| 1476111 | oak rough bulletgall wasp | Disholcaspis quercusmamma | pupa removed from pupal chamber |
| 1476116 | elm leaf beetle | Xanthogaleruca luteola | egg mass |
| 1476117 | elm leaf beetle | Xanthogaleruca luteola | egg mass |
| 1476118 | elm leaf beetle | Xanthogaleruca luteola | Newly hatched larvae, old egg mass and damage |
| 1476119 | elm leaf beetle | Xanthogaleruca luteola | late instar larva and frass |
| 1476120 | elm leaf beetle | Xanthogaleruca luteola | |
| 1476121 | elm leaf beetle | Xanthogaleruca luteola | larvae crawling on trunk to pupation sites |
| 1476122 | elm leaf beetle | Xanthogaleruca luteola | |
| 1476123 | elm leaf beetle | Xanthogaleruca luteola | |
| 1476124 | elm leaf beetle | Xanthogaleruca luteola | |
| 1476125 | poplar blackmine beetle | Zeugophora scutellaris | adult feeding injury |
| 5406048 | Thousand Cankers Disease | Geosmithia morbida | Black walnuts in the end stage of thousand cankers. Photograph taken August 5, 2009. Associated with walnut twig beetle. |
| 5369899 | cat-faced spider | Araneus gemmoides | Excrement |
| 5369913 | fall webworm | Hyphantria cunea | Extensive infestation with webbing covering trunk |
| 5406086 | Thousand Cankers Disease | Geosmithia morbida | Crown thinning symptoms with thousand cankers in advanced stage infestation. Associated with walnut twig beetle. |
| 5406096 | Thousand Cankers Disease | Geosmithia morbida | Canker development around walnut twig beetle gallery in English walnut. |
| 5406094 | Thousand Cankers Disease | Geosmithia morbida | Canker development around walnut twig beetle gallery in English walnut. |
| 5406090 | Thousand Cankers Disease | Geosmithia morbida | Walnut twig beetle galleries and cankers in trunk of hybrid walnut. Associated with walnut twig beetle. |
| 5406091 | Thousand Cankers Disease | Geosmithia morbida | Walnut twig galleries and cankers in branch of hybrid walnut. Associated with walnut twig beetle. |
| 5406088 | Thousand Cankers Disease | Geosmithia morbida | Branch cankers that have developed around twig beetle galleries. Geosmithia can be seen fruiting in the center gallery. Associated with the walnut twig beetle. |
| 5406089 | Thousand Cankers Disease | Geosmithia morbida | branch cankers that have developed around twig beetle galleries. Associated with the walnut twig beetle. |
| 5406085 | Thousand Cankers Disease | Geosmithia morbida | Second in series of two. Black walnuts are showing advanced symptoms of thousand cankers disease in this picture taken September 18, 2009. tree died the following June. Associated with walnut twig beetle. |
| 5406087 | walnut twig beetle | Pityophthorus juglandis | Branch cankers that have developed around twig beetle galleries. Associated with Thousand cankers disease. |
| 5408099 | Embellisia skin blotch and bulb canker of garlic | Embellisia allii | Magnification of 200X |
| 5408100 | Embellisia skin blotch and bulb canker of garlic | Embellisia allii | Magnification of 400X |
| 5408095 | Alternaria black molds / stem cankers | Alternaria spp. | |
| 5408096 | gray molds | Botrytis spp. | |
| 5408097 | Dutch elm disease | Ophiostoma ulmi | |
| 5408098 | Dutch elm disease | Ophiostoma ulmi | |
| 5406082 | walnut twig beetle | Pityophthorus juglandis | Lindgren funeling trapping of walnut twig beetle in Wheat Ridge, colorado. tree died during spring 2009. |
| 5406059 | walnut twig beetle | Pityophthorus juglandis | Pupae within trunk. |
| 5406060 | walnut twig beetle | Pityophthorus juglandis | Larvae and pupa. The geosmithia fungal associate is sporulating profusely around the pupal cells. |
| 5406061 | walnut twig beetle | Pityophthorus juglandis | Beetle gallery in Arizona wlanut. Callus tissue borders and confines this point of injury. |
| 5406063 | walnut twig beetle | Pityophthorus juglandis | External view of beetle gallery in Arizona walnut. Callus tissue borders and confines this point of injury. |
| 5406064 | walnut twig beetle | Pityophthorus juglandis | Logs skinned with a draw knife. These logs were highly attractive to adults, but larval survival was not noted in the skinned logs. |
| 5406065 | walnut twig beetle | Pityophthorus juglandis | Logs debarked with a chain saw. Numerous larvae successfully completed development in this log. |
| 5406058 | walnut twig beetle | Pityophthorus juglandis | Adult beetles withini nuptial chamber. |
| 5406056 | walnut twig beetle | Pityophthorus juglandis | Branch with dieback associated with infestation of walnut twig beetle in Arizona walnut. Associated with Thousand cankers disease. |
| 5406057 | walnut twig beetle | Pityophthorus juglandis | Adult beetles that emerged from two 18 inch black walnut logs. Walnut twig beetles continued to reinfest until cambium was completely consumed. A total of 23,040 beetles were recovered, approximately 36 per square inch of cambium area. |
| 5406062 | walnut twig beetle | Pityophthorus juglandis | Entry wounds made in trunk. A small amount of weeping can sometimes be observed when beetles enter trunks. |
| 5406073 | walnut twig beetle | Pityophthorus juglandis | Exit wounds made by adults. |
| 5406084 | walnut twig beetle | Pityophthorus juglandis | Exit wounds made by adults and larval tunneling in a branch. |
| 5406055 | walnut twig beetle | Pityophthorus juglandis | Twig dieback associated with infestation of walnut twig beetle in Arizona walnut. Associated with Thousand cankers disease. |
| 5406051 | walnut twig beetle | Pityophthorus juglandis | Teneral adults. A Geosmithia sp.fungus is sporulating profusely in the pupal chambers and cover the beetles. |
| 5406044 | Thousand Cankers Disease | Geosmithia morbida | Black walnut in end stage of thouand cankers. Photograph taken June 25, 2009; tree was removed one week later. During previos September symptoms were flaggong on a single branch. Associated with walnut twig beetle. |
| 5406083 | Thousand Cankers Disease | Geosmithia morbida | First in a series of two. Black walnuts that have recently died from thousand cankers disease. Photgraph taken June 11, 2009. Dieback was noted in September 18, 2008. |
| 5406077 | Thousand Cankers Disease | Geosmithia morbida | Canker produced following introduction of Geosmithia(isolate 12-181) into Northern california walnut seedling. Associated with walnut twig beetle. |
| 5406078 | Thousand Cankers Disease | Geosmithia morbida | Canker produced one week following introduction of Geosmithia (isolate 12-181) into southern California walnut seedling. Sporulation of the fungus is occuring at the edges of the wound.Associated with walnut twig beetle. |
| 5406079 | Thousand Cankers Disease | Geosmithia morbida | Canker produced approximately 5 weeks following introduction of Geosmithia (isolate 12-181) into Southern California walnut seedling. Sporulation of the fungus is occuring at the edges of the wound. |
| 5406080 | Thousand Cankers Disease | Geosmithia morbida | Canker produced approximately five weeks following the introduction of Geosmithia (isolate 12-181) into black walnut seedling. Associated with walnut twig beetle. |
| 5406081 | Thousand Cankers Disease | Geosmithia morbida | Canker produced approximately five weeks following introduction of Geosmithia (isolate 12-181) into black walnut seedling. Associated with walnut twig beetle. |
| 5406074 | Thousand Cankers Disease | Geosmithia morbida | Introduction of Geosmithia into wound during evaluation of Juglans susceptability to fungal pathogen of thousand cankers. Assocaited with walnut twig beetle. |
| 5406075 | Thousand Cankers Disease | Geosmithia morbida | Evaluation of Juglans seedlings for susceptibility to Geosmithia, the fungal pathogen of thousand cankers. Associated with walnut twig beetle. |
| 5406076 | Thousand Cankers Disease | Geosmithia morbida | Canker produced by control inoculation (1.2 PDA agar) of Norhtern california walnut. Normal wounds with no canker development results from this inoculation. Associated with walnut twig beetle. |
| 5406068 | Thousand Cankers Disease | Geosmithia morbida | Black walnut recently killed by thousand cankers disease. Associated with walnut twig beetle. |
| 5406069 | Thousand Cankers Disease | Geosmithia morbida | Black walnuts recently killed by thousand cankers. Symptoms were first noted two years prior and trees recieved multiple applications of soil-applied imidacloprid.associated with walnut twig beetle. |
| 5406070 | Thousand Cankers Disease | Geosmithia morbida | large hybrid walnut fell after succumbing to thousand cankers disease. Associated with walnutt wig beetle. |
| 5406071 | Thousand Cankers Disease | Geosmithia morbida | Large hybrid walnut fell after succumbing to thousand cankers disease. |
| 5406072 | Thousand Cankers Disease | Geosmithia morbida | Wounding of walnut with hollow cone punch to determine susceptibility to Geosnithia fungus. Associated with walnut twig beetle. |
| 5406067 | Thousand Cankers Disease | Geosmithia morbida | Crown thinning and dieback associated with end stage thousand cankers disease. Asociated with walnut twig beetle. |
| 5406066 | Thousand Cankers Disease | Geosmithia morbida | Large trunk cankers commomn in end stage infestations of thousand cankers. Several fungio, including Fusarium solani, can be cultured from these cankers. |
| 5406054 | Thousand Cankers Disease | Geosmithia morbida | Twig dieback associated with infestation of walnut twig beetle in Arizonia walnut.Associated with walnut twig beetle. |
| 5406052 | Thousand Cankers Disease | Geosmithia morbida | Black walnut with advanced symptons of cankers. Associated with walnut twig beetle. |
| 5406053 | Thousand Cankers Disease | Geosmithia morbida | Black walnuts recently killed by thousand cankers. trees first showed symptoms two years earlier and had recieved two applications of imidacloprid in attempt to control disease progression. Associated with walnut twig beetle. |
| 5406049 | Thousand Cankers Disease | Geosmithia morbida | Black walnut recently killed by thousand cankers. A healthy pecan is in the background. Associated with walnutt wig beetle. |
| 5406050 | Thousand Cankers Disease | Geosmithia morbida | Black walnut recently killed by thousand cankers. A healthy pecan is in background. Assocaited with walnut twig beetle. |
| 5406041 | Thousand Cankers Disease | Geosmithia morbida | Salvaged wlanut log from tree killed by thousand cankers stored in backyard.Associated with walnut twig beetle. |
| 5406042 | Thousand Cankers Disease | Geosmithia morbida | Training session to identify symptoms of thousand cankers.Assocaited with walnut twig beetle. |
| 5406043 | Thousand Cankers Disease | Geosmithia morbida | Training session to identify symptoms of thousand cankers. Associated with walnut twig beetle. |
| 5406045 | Thousand Cankers Disease | Geosmithia morbida | Black walnut in end stage of thousand cankers. Photograph June 25, 2009; tree was removed one week later. Associatd with walnut twig beetle. |
| 5406046 | Thousand Cankers Disease | Geosmithia morbida | Black walnut showing first external symptom of thousand cankers. A single flagging branch can be seen in the crown area on the upper right of the photograph. Associated with walnut twig beetle. |
| 5406047 | Thousand Cankers Disease | Geosmithia morbida | Black walnut showing early stage external symptoms of thousand cankers. A few branches in the crown are showing flagging and there is crown thinning. Associatd with walnut twig beetle. |
| 5406040 | walnut twig beetle | Pityophthorus juglandis | Last instar larva. Adjacent is a pupal cell with sporulating Geosmithia fungus. |
| 5024085 | walnut twig beetle | Pityophthorus juglandis | Adult gallery and associated Geosmithia sp. infection. |
| 5024089 | walnut twig beetle | Pityophthorus juglandis | adult gallery and associated Geosmithia sp. infection |
| 5393596 | bronze birch borer | Agrilus anxius | Exit hole in bark |
| 5393569 | alligator juniper | Juniperus deppeana | |
| 5393558 | alligator juniper | Juniperus deppeana | |
| 5393551 | alligator juniper | Juniperus deppeana | |
| 5393550 | alligator juniper | Juniperus deppeana | |
| 5393549 | alligator juniper | Juniperus deppeana | |
| 5393548 | alligator juniper | Juniperus deppeana | |
| 5393546 | alligator juniper | Juniperus deppeana | |
| 5393544 | Arizona walnut | Juglans major | Photo taken April 16, 2009 at Vallaneuva State Park, NM. The two planted arizona walnut were the only trees sustaining serious sapsucker injuries at the site |
| 5393542 | Arizona walnut | Juglans major | |
| 5393543 | Arizona walnut | Juglans major | |
| 5393540 | Arizona walnut | Juglans major | |
| 5393541 | Arizona walnut | Juglans major | |
| 5393538 | Arizona walnut | Juglans major | |
| 5393539 | Arizona walnut | Juglans major | |
| 5393534 | Arizona sycamore | Platanus wrightii | |
| 5393533 | Arizona sycamore | Platanus wrightii | Twigs. Photograph taken April 14, 2009. |
| 5393532 | Arizona sycamore | Platanus wrightii | |
| 5393531 | Arizona sycamore | Platanus wrightii | |
| 5393448 | alligator juniper | Juniperus deppeana | |
| 5382152 | Arizona walnut | Juglans major | Photograph of developing nuts taken July 17, 2008. |
| 5382033 | cicada | Platypedia putnami | |
| 5382063 | European elm flea weevil | Orchestes alni | Larval leafmine |
| 5382142 | Arizona walnut | Juglans major | Photograph of leaves and developing nuts taken July 17, 2008. |
| 5382185 | witches' broom | ||
| 5382186 | walnut twig beetle | Pityophthorus juglandis | Egg galleries produced under bark of large branch. |
| 5382187 | walnut twig beetle | Pityophthorus juglandis | Adults, including teneral adult, exposed from under bark. |
| 5382183 | walnut twig beetle | Pityophthorus juglandis | Extensive galleries produced in bark of large branch. |
| 5382184 | walnut twig beetle | Pityophthorus juglandis | Exit holes. |
| 5382178 | banded elm bark beetle | Scolytus schevyrewi | Pupa exposed from pupal chamber under bark. |
| 5382179 | banded elm bark beetle | Scolytus schevyrewi | Last instar larvae and pupa exposed from under bark. |
| 5382180 | banded elm bark beetle | Scolytus schevyrewi | Pupae in chambers under bark. |
| 5382181 | banded elm bark beetle | Scolytus schevyrewi | Late stage larva at end of tunnel. |
| 5382182 | banded elm bark beetle | Scolytus schevyrewi | Recently constructed entrance hole with small amount of weeping at wound site. |
| 5382174 | witches' broom | Multiple witches’ brooms along trunk. Photograph taken July 17, 2008 | |
| 5382175 | banded elm bark beetle | Scolytus schevyrewi | Adult at entrance of gallery |
| 5382176 | banded elm bark beetle | Scolytus schevyrewi | Pair mating at entrance of gallery. |
| 5382177 | banded elm bark beetle | Scolytus schevyrewi | Last instar larvae and pupae exposed from under bark. |
| 5382163 | Arizona walnut | Juglans major | Photograph of leaves and developing nuts taken July 18, 2008 |
| 5382146 | turbinella oak | Quercus turbinella | Branch with developing acorns. |
| 5382147 | turbinella oak | Quercus turbinella | Sonoran scrub oak growing alongside highway. |
| 5382148 | turbinella oak | Quercus turbinella | Sonoran scrub oak growing alongside highway. |
| 5382150 | boxelder | Acer negundo | Flowering boxelder, May 5, 2008 |
| 5382151 | boxelder | Acer negundo | Leaves emerging from bud. Photograph taken May 5, 2008 |
| 5382144 | turbinella oak | Quercus turbinella | Old mistletoe brooms and current season plant in scrub oak. Photographed July 19. |
| 5382145 | turbinella oak | Quercus turbinella | Scrub oak heavily infested with Cory’s mistletoe. Photographed July 19. |
| 5382143 | Cory's mistletoe | Phoradendron coryae | Pair of old mistletoe brooms in scrub oak and old dieback from earlier infestation. Photographed July 19. |
| 5382141 | Cory's mistletoe | Phoradendron coryae | Close-up of large mistletoe broom in scrub oak. Photographed July 19. |
| 5382140 | Cory's mistletoe | Phoradendron coryae | Large mistletoe broom in scrub oak. Photographed July 19. |
| 5382138 | western soapberry | Sapindus saponaria var. drummondii | Close up of branch with flower cluster. |
| 5382139 | western soapberry | Sapindus saponaria var. drummondii | |
| 5382134 | western soapberry | Sapindus saponaria var. drummondii | Whole tree in flower. Photographed July 19. |
| 5382135 | western soapberry | Sapindus saponaria var. drummondii | |
| 5382136 | western soapberry | Sapindus saponaria var. drummondii | Whole tree in flower. Photographed July 19. |
| 5382137 | western soapberry | Sapindus saponaria var. drummondii | Large branch in flower. Photographed July 19. |
| 5382131 | walnut twig beetle | Pityophthorus juglandis | Flagging of lower shaded branches infested with walnut twig beetle. |
| 5382120 | Arizona walnut | Juglans major | Small grove lining highway in national forest area. |
| 5382109 | Arizona walnut | Juglans major | Large specimen trees lining highway. |
| 5382100 | flatheaded borer | Poecilonota thureura | Adult observed on willow bark, June 12, 2008. |
| 5382098 | flatheaded borer | Poecilonota thureura | Adult observed on willow bark, June 12, 2008. |
| 5382099 | flatheaded borer | Poecilonota thureura | Adult observed on willow bark, June 12, 2008. |
| 5382067 | hackberry nipplegall maker | Pachypsylla celtidismamma | Psyllid galls that have been decapped by fox squirrels (Sciuris niger), that eat the mature nymphs in late summer. After feeding, the leaves are cut and drop to the ground. |
| 5382068 | hackberry nipplegall maker | Pachypsylla celtidismamma | Fallen leaves cut by fox squirrels (Sciuris niger) after they have decapped galls of the hackberry nipplegall maker and eaten the mature nymphs. |
| 5382066 | hackberry nipplegall maker | Pachypsylla celtidismamma | Psyllid galls that have been decapped by fox squirrels (Sciuris niger), that eat the mature nymphs in late summer. After feeding, the leaves are cut and drop to the ground. |
| 5382065 | poplar-and-willow borer | Cryptorhynchus lapathi | Mating pair. Photograph taken September 3. |
| 5382048 | stem decay of black walnut | Phellinus weirianus | Fruiting bodies on trunk. |
| 5382032 | walnut twig beetle | Pityophthorus juglandis | Boring dust at entrance of gallery. |
| 5382026 | Arizona walnut | Juglans major | Large witches’ broom on trunk. July 17, 2008 |
| 5188080 | hackberry witches' broom | Witches’ broom produced by effects of an eriophyid mite and/or an associated powdery mildew producing fungus (Aceria celtis (Kendall, 1929) and Sphaerotheca phytoptophila) | |
| 5188077 | hackberry witches' broom | Witches’ broom produced by effects of an eriophyid mite and/or an associated powdery mildew producing fungus (Aceria celtis (Kendall, 1929) and Sphaerotheca phytoptophila) | |
| 5188079 | hackberry witches' broom | Witches’ broom produced by effects of an eriophyid mite and/or an associated powdery mildew producing fungus (Aceria celtis (Kendall, 1929) and Sphaerotheca phytoptophila) | |
| 5188076 | hackberry witches' broom | Witches’ broom produced by effects of an eriophyid mite (Aceria celtis (Kendall, 1929)) and/or an associated powdery mildew producing fungus (Sphaerotheca phytoptophila) | |
| 5188046 | long-horned beetle | Eburia porulosa | Adult emerged from year-old timber |
| 5369737 | ash bead gall mite | Aceria fraxini | Leaf galls, lower surface |
| 5369744 | poplar rust | Melampsora medusae | Yellowish uredia on leaf underside produced shortly before leaf drop in early October |
| 5369733 | fall webworm | Hyphantria cunea | Late stage larvae in different color forms |
| 5361138 | quaking aspen | Populus tremuloides | Aspen foliage in autumn, Rocky Mountain National Park. |
| 5361137 | quaking aspen | Populus tremuloides | Aspen foliage in autumn, Rocky Mountain National Park, Colorado. |
| 5361136 | quaking aspen | Populus tremuloides | Aspen foliage in autumn, Rocky Mountain National Park. |
| 5366747 | Armillaria root rots | Armillaria spp. | Hardwood log covered with rhizomorphs of armillaria root rot (Armillaria sp.). |
| 5366667 | Siberian elm canker | Botryodiplodia hypodermia | Signs and symptoms of Botryodiplodia canker (Botryodiplodia hypodermia) on an elm trunk. |
| 5356781 | wetwood | ||
| 5356717 | sycamore anthracnose | Apiognomonia veneta | |
| 5356716 | sycamore anthracnose | Apiognomonia veneta | |
| 5356715 | Cytospora cankers | Cytospora spp. | Cytosporaspore tendrils on Sycamore |
| 5305013 | predatory stink bug | Podisus placidus | Mating pair. Female is feeding on larva of cottonwood leaf beetle |
| 5305035 | Pacific mistletoe | Phoradendron villosum | Whole plant (broom) on oak. Ashland, Oregon |
| 5305036 | Pacific mistletoe | Phoradendron villosum | Close-up of foliage. Ashland, Oregon. |
| 5305038 | Pacific mistletoe | Phoradendron villosum | Whole plant (broom) on oak. Ashland, Oregon. |
| 5304079 | sheep | Ovis aries | |
| 5304080 | sheep | Ovis aries | Trunk damage from grazing |
| 5304081 | sheep | Ovis aries | Trunk damage from grazing |
| 5303021 | European elm scale | Gossyparia spuria | Mature adult females packed into bark cracks |
| 5303042 | elm leaf beetle | Xanthogaleruca luteola | Extensive foliage injury by larvae |
| 5303072 | poplar borer | Saperda calcarata | Full grown larvae |
| 5303073 | poplar borer | Saperda calcarata | Full grown larvae |
| 5304002 | European elm scale | Gossyparia spuria | Sooty mold characteristic of chronic infestation by European elm scale in sites with little rainfall. |
| 5304003 | European elm scale | Gossyparia spuria | Sooty mold characteristic of chronic infestation by European elm scale in sites with little rainfall. |
| 5304006 | aphid | Tetraneura spp. | |
| 5304007 | aphid | Tetraneura spp. | |
| 5304008 | aphid | Tetraneura spp. | |
| 5304028 | fall webworm | Hyphantria cunea | Large tent enclosing branch |
| 5304029 | fall webworm | Hyphantria cunea | Frass collected at base of tent |
| 1325085 | oystershell scale | Lepidosaphes ulmi | recently settled crawlers |
| 1325089 | oystershell scale | Lepidosaphes ulmi | recently settled crawlers |
| 1476020 | acacia-ants | Pseudomyrmex ferrugineus | A Centeral American plant with mutualistic realationship with an ant species(Pseudomyrmex ferriginea) |
| 1476040 | elm cockscombgall aphid | Colopha ulmicola | Characteristic leaf galls |
| 5209062 | woolly apple aphid | Eriosoma lanigerum | Leaf curling injury on a hybrid elm |
| 5209063 | woolly apple aphid | Eriosoma lanigerum | Late spring colony in leaf curl |
| 5210014 | poplar vagabond aphid | Mordvilkoja vagabunda | Dried 'pseudo-gall' produced in twigs of host plant. |
| 5211002 | ash borer | Podosesia syringae | Infested ash trunk with pupal skins extruding from exit wounds |
| 5209033 | bronze birch borer | Agrilus anxius | |
| 5209034 | poplar twiggall fly | Hexomyza schineri | Old injury. The original damage was the normal twig gall and the insect has absented the gall for many years.. As the plant grows this swelling injury continues to be incorporated into new wood. |
| 5188073 | western tent caterpillar | Malacosoma californicum | Early stage larvae shortly after egg hatch. Photograph taken April 21, 2007. Larimer County, Colorado |
| 5188074 | western tent caterpillar | Malacosoma californicum | Early stage larvae shortly after egg hatch. Photograph taken April 21, 2007. Larimer County, Colorado |
| 5188075 | western tent caterpillar | Malacosoma californicum | Early stage larvae shortly after egg hatch. Photograph taken April 21, 2007. Larimer County, Colorado |
| 1491050 | redheaded ash borer | Neoclytus acuminatus | |
| 5000005 | long-horned beetle | Eburia spp. | July 14, 2006 |
| 1475074 | great ash sphinx | Sphinx chersis | close-up of head |
| 1475075 | great ash sphinx | Sphinx chersis | |
| 1475010 | banded elm bark beetle | Scolytus schevyrewi | adults and associated twig feeding |
| 1475011 | banded elm bark beetle | Scolytus schevyrewi | adults and associated twig feeding |
| 1475017 | hackberry nipplegall maker | Pachypsylla celtidismamma | adult recently emerged from gall and adjacent to nymphal skins |
| 1475042 | forest tent caterpillar | Malacosoma disstria | Mass of larvae on trunk. Lighter colored caterpillars have recently molted. |
| 5083042 | lace bugs | Teleonemia spp. | and stippling injury on upper leaf surface. Photo taken September 4, 2006 |
| 5083049 | Knab's leaf beetle | Chrysomela knabi | showing cream color in early June |
| 5083051 | poplar twiggall fly | Hexomyza schineri | Leaf injury produced as adult feeding wounds by ovipositon punctures. |
| 5083073 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | twig curling produced by infestation of leafcurl ash aphid |
| 5083074 | leafcurl ash aphid | Meliarhizophagus fraxinifolii | Clumped leaves at terminals produced by earlier aphid injury are visible during leaf drop in fall. |
| 5083090 | poplar twiggall fly | Hexomyza schineri | ovipositing in new growth |
| 5084005 | fall webworm | Hyphantria cunea | late instar larvae of morph common in northern Colorado |
| 5084015 | Knab's leaf beetle | Chrysomela knabi | in spring |
| 5084024 | cottonwood leaf beetle | Chrysomela scripta | larvae everting defensive glands |
| 5084026 | cottonwood leaf beetle | Chrysomela scripta | in late summer |
| 5084027 | little black and green willow aphid | Chaitophorus viminalis | |
| 5084029 | Knab's leaf beetle | Chrysomela knabi | late stage larva |
| 5084030 | cottonwood leaf beetle | Chrysomela scripta | mating |
| 5084038 | reddish brown poplar aphid | Pterocomma populifoliae | small colony on poplar twig |
| 5084043 | cottonwood leaf beetle | Chrysomela scripta | mixed larval stages |
| 5084048 | oak rough bulletgall wasp | Disholcaspis quercusmamma | galls |
| 5084049 | reddish brown poplar aphid | Pterocomma populifoliae | mother giving birth |
| 5084050 | hackberry blistergall psyllid | Pachypsylla celtidisvesiculum | near developing galls of hackberry nipple maker psyllid |
| 5082081 | oak rough bulletgall wasp | Disholcaspis quercusmamma | galls very densely clustered on a small twig |
| 5082083 | uglynest caterpillar | Archips cerasivorana | larvae in tent with leaf fragments and frass |
| 5082084 | uglynest caterpillar | Archips cerasivorana | larvae in tent with leaf fragments and frass |
| 5082098 | short-horned leaf beetle | Coleothorpa vittigera | |
| 5082099 | poplar budgall mite | Eriophyes parapopuli | overwintered galls on twigs |
| 5083018 | oak rough bulletgall wasp | Disholcaspis quercusmamma | shortly after emergence. Picture taken November 3, 2006 |
| 5083019 | oak rough bulletgall wasp | Disholcaspis quercusmamma | side view. Picture taken during period of emergence (November 3, 2006) |
| 5083020 | oak rough bulletgall wasp | Disholcaspis quercusmamma | side view. Picture taken during adult emergence (November 3, 2006) |
| 5083021 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Adult palpitating bud during examination prior to oviposition (November 3, 2006) |
| 5083022 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Galls at time when adults are emerging. The gall in foreground with irregular wound was made by a bird feeding on the gall. |
| 5083033 | cottonwood leaf beetle | Chrysomela scripta | |
| 5083039 | lace bugs | Teleonemia spp. | with nymph and tar spot droppings. Photo taken September 4, 2006 |
| 5083040 | lace bugs | Teleonemia spp. | photo taken September 4, 2006 |
| 5024054 | western tent caterpillar | Malacosoma californicum | late instar larvae on tent |
| 5024055 | western tent caterpillar | Malacosoma californicum | late stage larvae of mixed instars |
| 5024056 | western tent caterpillar | Malacosoma californicum | Pupa within a cocoon. June 12, 2006 |
| 5024072 | boxelder bug | Boisea trivittata | Mixed life stages massed on tree trunk |
| 5024073 | boxelder bug | Boisea trivittata | on boxelder seeds |
| 5024074 | boxelder bug | Boisea trivittata | |
| 5024076 | boxelder bug | Boisea trivittata | teneral adult |
| 5024077 | boxelder bug | Boisea trivittata | mixed life stages on base of trunk |
| 5024020 | willow scale | Diaspidiotus gigas | mixed life stages on aspen branch |
| 5024090 | walnut twig beetle | Pityophthorus juglandis | Larvae associate with area of Fusarium infection on trunk. |
| 5024091 | walnut twig beetle | Pityophthorus juglandis | Twig dieback associated with twig beetle infestation. |
| 5024087 | walnut twig beetle | Pityophthorus juglandis | Late summer wilting associated with twig beetle and general decline in late summer. |
| 5024088 | walnut twig beetle | Pityophthorus juglandis | Extension larval tunnel in trunk area associated with Fusarium sp. infection. |
| 5024052 | western tent caterpillar | Malacosoma californicum | late instar larva |
| 5024013 | locust borer | Megacyllene robiniae | trunk of heavily infested tree |
| 2200069 | honeylocust leafhopper | Macropsis fumipennis | Adult on honeylocust twig. May 27, 2006 |
| 2200082 | elm leafminer | Kaliofenusa ulmi | leafmines about 10 days after egg hatch |
| 2200079 | poplar twiggall fly | Hexomyza schineri | Oviposition wounding by adults. Small punctures and tattered leaves indicate feeding wounds made by adults |
| 2200085 | elm leafminer | Kaliofenusa ulmi | Leafmines about 5-6 days after egg hatch |
| 5000003 | cottonwood borer | Plectrodera scalator | Newly emerged adult on twig. July 12, 2006 |
| 2200038 | elm leafminer | Kaliofenusa ulmi | May 7, 2006 |
| 2200039 | elm leafminer | Kaliofenusa ulmi | May 8, 2006 |
| 2200040 | elm leafminer | Kaliofenusa ulmi | May 6, 2006 |
| 2200041 | elm leafminer | Kaliofenusa ulmi | larvae silhouetted within leaf mine of Siberian elm leaf; May 28, 2006 |
| 1455146 | Dutch elm disease | Ophiostoma ulmi | Girdling cut made upon detection to prevent root graft transmission |
| 1455178 | fall webworm | Hyphantria cunea | In tent |
| 1455174 | western tent caterpillar | Malacosoma californicum | Tent |
| 1455117 | leafcurl plum aphid | Brachycaudus helichrysi | Severe leaf curling |
| 1455147 | smaller European elm bark beetle | Scolytus multistriatus | |
| 1455164 | southwestern tent caterpillar | Malacosoma incurvum | |
| 1455166 | southwestern tent caterpillar | Malacosoma incurvum | |
| 1455167 | southwestern tent caterpillar | Malacosoma incurvum | |
| 1455172 | western tent caterpillar | Malacosoma californicum | |
| 1455162 | southwestern tent caterpillar | Malacosoma incurvum | Under eaves of bridge |
| 1455049 | poplar leaffolding sawfly | Phyllocolpa bozemani | Young larva in leaf fold |
| 1455051 | poplar leaffolding sawfly | Phyllocolpa bozemani | Leaf fold symptom produced by young larva |
| 1455021 | elm leafminer | Kaliofenusa ulmi | |
| 1246039 | poplar-and-willow borer | Cryptorhynchus lapathi | |
| 1246007 | carpenterworm | Prionoxystus robiniae | |
| 1246010 | leaf blotch miners | Phyllonorycter spp. | Exposed from mine |
| 1246003 | white-lined sphinx | Hyles lineata | |
| 1246004 | white-lined sphinx | Hyles lineata | full grown |
| 1246005 | big poplar sphinx | Pachysphinx occidentalis | |
| 1326176 | big poplar sphinx | Pachysphinx occidentalis | Young larva. |
| 1326205 | banded elm bark beetle | Scolytus schevyrewi | Newly introduced species in western US. Found on Elm, caragana, and Russian olive. |
| 1243101 | aster leafhopper | Macrosteles quadrilineatus | |
| 1243080 | plum fingergall mite | Phytoptus emarginatae | Mites within amongst erineum of fingergall |
| 1326202 | chalcid wasp | Phasgonophora sulcata | parasitoid of Agrilus spp. |
| 1326206 | banded elm bark beetle | Scolytus schevyrewi | Newly introduced species in western US. Found on Elm, caragana, and Russian olive. |
| 1326234 | giant willow aphid | Tuberolachnus salignus | Colony on Willow stem. |
| 1326178 | big poplar sphinx | Pachysphinx occidentalis | Mating pair. |
| 1326181 | western boxelder bug | Boisea rubrolineata | Adult Boxelder, other maples. |
| 1326201 | bronze birch borer | Agrilus anxius | Adult with Phasgonophora sulcata, a parasitoid of Agrilus spp. |
| 1326148 | common falsepit scale | Lecanodiaspis prosopidis | Mature scales on green ash branch. |
| 1326203 | bronze birch borer | Agrilus anxius | |
| 1326208 | boxelder bug | Boisea trivittata | Adults and nymphs on Boxelder. |
| 1326209 | boxelder bug | Boisea trivittata | on Boxelder. |
| 1326210 | boxelder bug | Boisea trivittata | Nymphs at egghatch on Boxelder. |
| 1326211 | boxelder bug | Boisea trivittata | Eggs on Boxelder. |
| 1326212 | boxelder bug | Boisea trivittata | on Boxelder. |
| 1326221 | elm leaf aphid | Tinocallis ulmifolii | Winged and wingless adults. American Elm. |
| 1326213 | rosy apple aphid | Dysaphis plantaginea | Colony on Apple. |
| 1326214 | apple aphid | Aphis pomi | Colony found on Apple and crabapple. |
| 1325099 | oak rough bulletgall wasp | Disholcaspis quercusmamma | Adult at oviposition in dormant bud |
| 1325081 | oystershell scale | Lepidosaphes ulmi | Crawlers present after egg hatch |
| 1325084 | poplar borer | Saperda calcarata | |
| 1325012 | honeylocust spider mite | Platytetranychus multidigituli | Female (right) and male (left) |
| 1325057 | hackberry nipplegall maker | Pachypsylla celtidismamma | Large swellings produced by nipplegall maker. Smaller swellings by hackberry blistergall psyllid |
| 1326051 | hunting wasp | Pemphredon spp. | Larval cells in excavated pith |
| 1326055 | Eriophyid mite | Leaf folding induced by eriophyid mite, top view | |
| 1326053 | hunting wasp | Pemphredon spp. | Recently emerged adult nesting in green ash twig |
| 1326099 | columbine leafminer | Phytomyza aquilegivora | |
| 1326100 | columbine leafminer | Phytomyza aquilegivora | Leafmine and oviposition punctures |
| 1326088 | cherry curculio | Anthonomus consors | Cavity in pit produced by developing larva |
| 1326085 | cherry curculio | Anthonomus consors | Feeding punctures on fruit |
| 1326086 | cherry curculio | Anthonomus consors | Adults on foliage |
| 1326097 | columbine leafminer | Phytomyza aquilegivora | Larva exposed from leafmine |
| 1326117 | European elm scale | Eriococcus spuria | Male cocoons |
| 1326118 | European elm scale | Eriococcus spuria | Mature female and crawlers |
| 1326113 | European elm scale | Eriococcus spuria | Overwintering forms on twigs |
| 1325100 | ash borer | Podosesia syringae | mating pair |
| 1325093 | oystershell scale | Lepidosaphes ulmi | of aspen |
| 1325094 | fletcher scale | Parthenolecanium fletcheri | |
| 1325096 | rose stem girdler | Agrilus cuprescens | |
| 1325097 | oystershell scale | Lepidosaphes ulmi | flipped to expose eggs |
| 1325098 | fletcher scale | Parthenolecanium fletcheri | |
| 1325058 | hackberry bud gall maker | Pachypsylla celtidisgemma | |
| 1325059 | hackberry nipplegall maker | Pachypsylla celtidismamma | |
| 1325060 | walking cicada | Okanagana synodica | |
| 1325062 | ash flower gall mite | Eriophyes fraxiniflora | |
| 1325063 | honeylocust plant bug | Diaphnocoris chlorionis | |
| 1325064 | currant borer | Synanthedon tipuliformis | |
| 1325065 | hackberry witches' broom | a gall produced by the effect of an eriophyid mite (Aceria celtis (Kendall, 1929)) celtis) and powdery mildew (Sphaerotheca phytoptophila) | |
| 1325013 | California pear sawfly | Pristiphora abbreviata | larva and feeding injury |
| 1325014 | California pear sawfly | Pristiphora abbreviata | larva and feeding injury |
| 1325015 | California pear sawfly | Pristiphora abbreviata | larva and feeding injury |
| 1325010 | oak apple gall | Amphibolips spp. | opened to expose interior structure |
| 1325011 | honeylocust spider mite | Platytetranychus multidigituli | |
| 1325074 | poplar budgall mite | Eriophyes parapopuli | gall |
| 1325076 | honeylocust pod gall midge | Dasineura gleditchiae | |
| 1325077 | cottonwood catkingall mite | Eriophyes neoessegi | catkin gall |
| 1325078 | Eriophyid mites | Eriophyes spp. | fingergalls on wild plum |
| 1325079 | chokecherry midge | Contarinia virginianae | exposed in gall |
| 1325080 | honeylocust pod gall midge | Dasineura gleditchiae | |
| 1325067 | currant aphid | Cryptomyzus ribis | |
| 1325068 | honeylocust pod gall midge | Dasineura gleditchiae | larvae and pupa in gall |
| 1325069 | hackberry witches' broom | a gall produced by the effect of an eriophyid mite (Aceria celtis (Kendall, 1929)) and powdery mildew (Sphaerotheca phytoptophila) | |
| 1325070 | appleleaf blister mite | Eriophyes mali | |
| 1325071 | currant aphid | Cryptomyzus ribis | |
| 1325072 | honeylocust pod gall midge | Dasineura gleditchiae | |
| 1325053 | hackberry nipplegall maker | Pachypsylla celtidismamma | |
| 1325054 | hackberry bud gall maker | Pachypsylla celtidisgemma | |
| 1325055 | honeylocust plant bug | Diaphnocoris chlorionis | |
| 1325056 | rough stink bug | Brochymena quadripustulata | |
| 1325006 | honeylocust spider mite | Platytetranychus multidigituli | overwintered forms on bark |
| 1325007 | honeylocust spider mite | Platytetranychus multidigituli | overwintered forms on bark |
| 1325008 | honeylocust spider mite | Platytetranychus multidigituli | mites and eggs at base of leaflet |
| 1325019 | twospotted spider mite | Tetranychus urticae | |
| 1325020 | twospotted spider mite | Tetranychus urticae | |
| 1325037 | ash plant bug | Tropidosteptes amoenus | nymphs and injury |
| 1325038 | ash plant bug | Tropidosteptes amoenus | |
| 1325039 | ash plant bug | Tropidosteptes amoenus | |
| 1325041 | hackberry blistergall psyllid | Pachypsylla celtidisvesiculum | |
| 1325042 | hackberry nipplegall maker | Pachypsylla celtidismamma | nymph of hackberry blistergall psyllid (smaller) and hackberry nipplegall maker psyllid exposed from galls |
| 1325043 | buffalo treehopper | Stictocephala bisonia | |
| 1325044 | honeylocust plant bug | Diaphnocoris chlorionis | crown thinning produced by feeding injury |
| 1325045 | hackberry nipplegall maker | Pachypsylla celtidismamma | |
| 1325046 | hackberry nipplegall maker | Pachypsylla celtidismamma | |
| 1325047 | buffalo treehopper | Stictocephala bisonia | oviposition scars |
| 1325048 | honeylocust plant bug | Diaphnocoris chlorionis | |
| 1325049 | hackberry blistergall psyllid | Pachypsylla celtidisvesiculum | |
| 1325050 | hackberry blistergall psyllid | Pachypsylla celtidisvesiculum | with nymphal skins left after emergence from gall |
| 1325051 | honeylocust leafhopper | Macropsis fumipennis |
