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William Jacobi's Images

Title: Professor
Organization: Colorado State University
Unit: Bioagricultural Sciences and Pest Management
Country: United States

279 Images of 74 Subjects View Subject List View Image Details View Thumbnails

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Image Subject Name Scientific Name Description
5366732 Tubercularia cankers Tubercularia spp. Honeylocust tree exhibiting symptoms of Tubercularia canker (Tubercularia sp.).
5366670 Scleroderris canker of western firs Grovesiella abieticola Apothecia of Scleroderris canker on a subalpine fir.
5366669 Scleroderris canker of western firs Grovesiella abieticola Evidence of Scleroderris canker on a twig of subalpine fir.
5366668 Scleroderris canker of western firs Grovesiella abieticola Scleroderris canker on a branch of subalpine fir.
5366989 comandra blister rust Cronartium comandrae Signs of comandra rust (Cronartium comandrae), exposed by squirrels, under the bark of a lodgepole pine.
5367244 bacterial wetwood Enterobacter nimipressuralis Cottonwood tree showing symptoms of infection with bacterial wetwood.
5366716 Thyronectria canker Thyronectria austroamericana Symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366947 polypore fungi Polyporus spp. Polyporus conks growing on a piece of downed wood in the forest.
5366943 indian paint fungus Echinodontium tinctorium Conk of Indian paint fungus (Echinodontium tinctorium) on the trunk of a white fir (Abies concolor) in southern Colorado.
5366933 Phellinus fungus Phellinus pomaceus Conk of Phellinus pomaceus, a fungus that attacks various fruit trees, particularly those in the genus Prunus (plums, peaches, cherries).
5367257 fire blight Erwinia amylovora Evidence of fire blight (Erwinia amylovora) on the branch of a crabapple.
5367254 fire blight Erwinia amylovora Evidence of fire blight (Erwinia amylovora) on the trunk of a crabapple.
5367242 bacterial wetwood Enterobacter nimipressuralis Elm tree showing slime flux, evidence of infection with bacterial wetwood.
5367206 unknown fungi Root collar rot on a honeylocust tree (Gleditsia triacanthos).
5367205 unknown fungi Root collar rot on a honeylocust tree (Gleditsia triacanthos).
5367203 unknown fungi Root collar rot on a honeylocust tree (Gleditsia triacanthos).
5367204 unknown fungi Root collar rot on a honeylocust tree (Gleditsia triacanthos).
5367202 unknown fungi Root collar rot on a honeylocust tree (Gleditsia triacanthos).
5366809 anthracnose Apiognomonia spp. Sycamore tree showing defoliation as a result of anthracnose (Apiognomonia sp.).
5366808 anthracnose Apiognomonia spp. Trunk of sycamore tree showing symptoms of infection with anthracnose (Apiognomonia sp.).
5366807 anthracnose Apiognomonia spp. Sycamore leaf showing signs of infection with anthracnose (Apiognomonia sp.).
5366806 anthracnose Apiognomonia spp. Sycamore tree showing defoliation as a result of anthracnose (Apiognomonia sp.).
5366805 anthracnose Apiognomonia spp. Twig blight symptoms of anthracnose (Apiognomonia sp.) on a sycamore.
5366731 Tubercularia cankers Tubercularia spp. Sporodochia fruiting structures of Tubercularia canker on the trunk of a hardwood tree.
5366730 Tubercularia cankers Tubercularia spp. Sporodochia fruiting structures of Tubercularia canker on limbs of a hardwood tree(s).
5366993 limb rust Peridermium filamentosum Ponderosa pine tree showing evidence of infection with limb rust (Peridermium filamentosum).
5366992 limb rust Peridermium filamentosum Evidence of limb rust (Peridermium filamentosum) on the branch of a ponderosa pine.
5366991 limb rust Peridermium filamentosum Evidence of limb rust (Peridermium filamentosum) on the limb of a ponderosa pine.
5366990 comandra blister rust Cronartium comandrae "Spike top" symptom of comandra rust (Cronartium comandrae) in a lodgepole pine.
5366988 comandra blister rust Cronartium comandrae Signs of comandra rust (Cronartium comandrae) on the limb of a lodgepole pine.
5366987 comandra blister rust Cronartium comandrae Signs of comandra rust (Cronartium comandrae) on the trunk of a lodgepole pine.
5366986 comandra blister rust Cronartium comandrae Signs of comandra rust (Cronartium comandrae) on the trunk of a pine.
5366985 comandra blister rust Cronartium comandrae Comandra plant showing signs of comandra blister rust (Cronartium comandrae), which affects pines.
5366984 comandra blister rust Cronartium comandrae Comandra plant showing signs of comandra blister rust (Cronartium comandrae), which affects pines.
5366983 comandra blister rust Cronartium comandrae Comandra plant showing signs of comandra blister rust (Cronartium comandrae), which affects pines.
5366982 white pine blister rust Cronartium ribicola Signs of white pine blister rust (Cronartium ribicola) on the trunk of a sugar pine.  
5366981 white pine blister rust Cronartium ribicola Signs of white pine blister rust (Cronartium ribicola) on a branch of limber pine.
5366980 white pine blister rust Cronartium ribicola Signs of white pine blister rust (Cronartium ribicola) on a branch of limber pine.
5366977 fir broom rust Melampsorella caryophyllacearum Fir tree showing characteristic symptoms of fir broom rust (Melampsorella caryophyllacearum).
5366976 spruce broom rust Chrysomyxa arctostaphyli Spruce tree showing symptoms of spruce broom rust, Chrysomyxa arctostaphyli.
5366975 spruce broom rust Chrysomyxa arctostaphyli Spruce trees exhibiting symptoms of spruce broom rust, Chrysomyxa arctostaphyli.
5366972 Melampsora rusts Melampsora spp. Symptoms of rust infection (Melampsora sp.) in cottonwood.
5366971 Melampsora rusts Melampsora spp. Rust spores (Melampsora sp.) on a cottonwood leaf.
5366970 Melampsora rusts Melampsora spp. Signs of rust spores (Melampsora sp.) on lanceleaf cottonwood.
5366969 Melampsora rusts Melampsora spp. Microscope view of rust spores (Melampsora sp.) from lanceleaf cottonwood.
5366966 western gall rust Endocronartium harknessii Pine tree in a plantation showing symptoms of western gall rust.
5366965 western gall rust Endocronartium harknessii Hip canker of western gall rust (Endocronartium harknessii) on a lodgepole pine.
5366961 Gynosporanium rusts Gymnosporangium spp. Telia of Gymnosporangium rust (Gymnosporangium sp.) on la juniper.
5366960 Gynosporanium rusts Gymnosporangium spp. Gymnosporangium rust (Gymnosporangium sp.) on a leaf of Toba hawthorn (Crataegus x mordenensis).
5366959 Gynosporanium rusts Gymnosporangium spp. Aecia of Gymnosporangium rust (Gymnosporangium sp.) on leaves of a hawthorn.
5366958 Gynosporanium rusts Gymnosporangium spp. Aecia of Gymnosporangium rust (Gymnosporangium sp.) on leaves of Toba hawthorn (Crataegus x mordenensis).
5366956 Gynosporanium rusts Gymnosporangium spp. Witches' brooms in a juniper, caused by a rust (Gymnosporangium sp.).
5366955 Gynosporanium rusts Gymnosporangium spp. Juniper rust (Gymnosporangium sp.) on its alternate host, serviceberry.
5366954 Gynosporanium rusts Gymnosporangium spp. Juniper tree with witches' broom caused by juniper broom rust.
5366953 juniper broom rust Gymnosporangium speciosum Symptoms of orange gall rust (Gymnosporangium speciosum) on a juniper.
5366952 juniper broom rust Gymnosporangium speciosum Orange gall rust (Gymnosporangium speciosum) on a juniper.
5366941 indian paint fungus Echinodontium tinctorium View of the underside of an Echinodontium tinctorium conk.
5366942 indian paint fungus Echinodontium tinctorium An Echinodontium tinctorium conk.
5366938 red heart of pine Phellinus pini Phellinus pini conk.
5366937 red heart of pine Phellinus pini Phellinus pini conk.
5366936 laminated root disease Phellinus weirii Ectotrophic mycelium of the root disease Phellinus weirii, which causes decay in conifer trees.
5366935 laminated root disease Phellinus weirii Evidence of laminated root disease (Phellinus weirii) in douglas-fir.
5366931 carbon balls Daldinia concentrica Conks of carbon ball fungus (Daldinia concentrica) on aspen.
5366929 sulfur shelf Laetiporus sulphureus Conks of sulfur shelf fungus (Laetiporus sulphureus).
5366928 sulfur shelf Laetiporus sulphureus Conks of sulfur shelf fungus (Laetiporus sulphureus) on a rotting stump.
5366922 white heartwood rot Phellinus tremulae Section of aspen showing decay due to Phellinus tremulae.
5366921 white heartwood rot Phellinus tremulae Conk of Phellinus tremulae on the trunk of an aspen.
5366920 white heartwood rot Phellinus tremulae Conks of Phellinus tremulae on the trunks of aspen trees.
5366919 oyster mushroom Pleurotus ostreatus Oyster mushroom (Pleurotus ostreatus) on the trunk of a boxelder tree (Acer negundo).
5366909 Trametes wood decay Trametes hirsuta Conk of Trametes hirsuta, which causes decay in several species of hardwood trees.
5366908 Trametes wood decay Trametes hirsuta Conk of Trametes hirsuta, which causes decay in several species of hardwood trees.
5367258 fire blight Erwinia amylovora Branch of a crabapple tree symptomatic of infection with fire blight (Erwinia amylovora).
5367256 fire blight Erwinia amylovora Branch of a crabapple tree symptomatic of infection with fire blight (Erwinia amylovora).
5367255 fire blight Erwinia amylovora Dead branch symptomatic of infection with fire blight (Erwinia amylovora).
5367253 fire blight Erwinia amylovora Branch of a crabapple tree symptomatic of infection with fire blight (Erwinia amylovora).
5367252 fire blight Erwinia amylovora Branch of a crabapple tree symptomatic of infection with fire blight (Erwinia amylovora).
5367251 fire blight Erwinia amylovora Dead branch of crabapple, symptomatic of infection with fire blight (Erwinia amylovora).
5367250 fire blight Erwinia amylovora Twig of a crabapple tree showing symptoms of infection with fire blight (Erwinia amylovora).
5367249 fire blight Erwinia amylovora Dead branch symptomatic of infection with fire blight (Erwinia amylovora).
5367248 crown gall Rhizobium radiobacter Cottonwood tree with a very large crown gall (Agrobacterium tumefaciens) high on the trunk.
5367247 crown gall Rhizobium radiobacter Juniper seedling afflicted with crown gall (Agrobacterium tumefaciens).
5367246 crown gall Rhizobium radiobacter Cottonwood tree afflicted with crown gall (Agrobacterium tumefaciens).
5367245 crown gall Rhizobium radiobacter Cottonwood tree afflicted with crown gall (Agrobacterium tumefaciens).
5367243 bacterial wetwood Enterobacter nimipressuralis An American elm tree (Ulmus americana) showing symptoms of bacterial wetwood (slime flux) on the campus of Colorado State University.
5367241 bacterial wetwood Enterobacter nimipressuralis Cottonwood tree showing symptoms of infection with bacterial wetwood.
5367240 bacterial wetwood Enterobacter nimipressuralis American elm tree showing evidence of infection with bacterial wetwood, or slime flux.
5367238 bacterial leaf spot Pseudomonas syringae Symptoms of bacterial blight (Pseudomonas syringae) on a lilac.
5367237 bacterial leaf spot Pseudomonas syringae Signs and symptoms of bacterial blight (Pseudomonas syringae) on a lilac.
5367236 bacterial leaf spot Pseudomonas syringae Symptoms of bacterial blight (Pseudomonas syringae) on a lilac.
5367235 bacterial leaf spot Pseudomonas syringae Symptoms of bacterial blight (Pseudomonas syringae) on leaves of a lilac.
5367234 bacterial leaf spot Pseudomonas syringae Signs and symptoms of bacterial blight (Pseudomonas syringae) on a lilac.
5367233 ash yellows phytoplasma Candidatus Phytoplasma fraxini White ash tree afflicted with ash yellows, a phytoplasma disease.
5367232 ash yellows phytoplasma Candidatus Phytoplasma fraxini Green ash tree afflicted with ash yellows, a phytoplasma disease.
5367231 ash yellows phytoplasma Candidatus Phytoplasma fraxini Green ash tree afflicted with ash yellows, a phytoplasma disease.  
5367230 ash yellows phytoplasma Candidatus Phytoplasma fraxini White ash tree afflicted with ash yellows, a phytoplasma disease.
5367229 ash yellows phytoplasma Candidatus Phytoplasma fraxini Close-up view of leaves of a green ash tree afflicted with ash yellows, a phytoplasma disease.
5367228 ash yellows phytoplasma Candidatus Phytoplasma fraxini Green ash tree afflicted with ash yellows, a phytoplasma disease.
5367227 juniper mistletoe Phoradendron juniperinum Juniper mistletoe (Phoradendron juniperum), a true mistletoe, growing in a juniper tree.
5367226 juniper mistletoe Phoradendron juniperinum Juniper mistletoe (Phoradendron juniperum), a true mistletoe, growing in a juniper tree.
5367225 juniper mistletoe Phoradendron juniperinum Juniper mistletoe (Phoradendron juniperum), a true mistletoe, growing in a juniper tree.
5367224 juniper mistletoe Phoradendron juniperinum Juniper mistletoe (Phoradendron juniperum), a true mistletoe, growing in a juniper tree.
5367222 dwarf mistletoes Arceuthobium spp. Dwarf mistletoe (Arceuthobium sp.) on a limber pine.
5367221 dwarf mistletoes Arceuthobium spp. Lodgepole pine trees infected with dwarf mistletoe (Arceuthobium sp.).
5367220 dwarf mistletoes Arceuthobium spp. Close-up view of dwarf mistletoe (Arceuthobium sp.) on a lodgepole pine.
5367219 dwarf mistletoes Arceuthobium spp. Lodgepole pine trees infected with dwarf mistletoe (Arceuthobium sp.).
5367218 dwarf mistletoes Arceuthobium spp. Close-up view of dwarf mistletoe (Arceuthobium sp.) on a ponderosa pine.
5367217 dwarf mistletoes Arceuthobium spp. Dwarf mistletoe (Arceuthobium sp.) on a ponderosa pine.
5367216 dwarf mistletoes Arceuthobium spp. Dwarf mistletoe (Arceuthobium sp.) on a ponderosa pine.
5367214 dwarf mistletoes Arceuthobium spp. Dwarf mistletoe (Arceuthobium sp.) on a white pine.
5366449 root problems Pinyon pine showing severe symptoms of oxygen starvation of the roots, as well as root rot.
5367198 black stain root disease Ophiostoma wageneri Black stain (Leptographium wageneri) fungus on the root of a pinyon pine.
5367199 black stain root disease Ophiostoma wageneri Black stain (Leptographium wageneri) fungus under the bark of a pinyon pine
5367200 black stain root disease Ophiostoma wageneri Black stain (Leptographium wageneri) fungus on the root of a pinyon pine.
5367201 black stain root disease Ophiostoma wageneri Pinyon pine showing severe symptoms of infection with black stain (Leptographium wageneri) fungus.
5367209 pinyon dwarf mistletoe Arceuthobium divaricatum Pinyon pines infected with dwarf mistletoe (Arceuthobium divaricatum).
5367210 pinyon dwarf mistletoe Arceuthobium divaricatum Dwarf mistletoe (Arceuthobium divaricatum) on pinyon pine.
5367208 dwarf mistletoes Arceuthobium spp. Dwarf mistletoe (Arceuthobium sp.) and Cytospora canker (Cytospora sp.) on a white fir.
5367207 dwarf mistletoes Arceuthobium spp. Dwarf mistletoe (Arceuthobium sp.) and Cytospora canker (Cytospora sp.) on a white fir.
5367197 annosum root disease Heterobasidion annosum Basidiocarps of annosum root rot (Heterobasidion annosum) on a fir.
5367196 Armillaria root rots Armillaria spp. White fir (Abies concolor) trees showing symptoms of either armillaria (Armillaria sp.) or annosum (Heterobasidion annosum) root rot.
5367195 annosum root disease Heterobasidion annosum Root rot symptoms in a tree, due to either annosum (Heterobasidion annosum) or Armillaria sp.
5367194 annosum root disease Heterobasidion annosum Annosum stain (Heterobasidion annosum) in a cross-section of wood.
5367193 annosum root disease Heterobasidion annosum Basidiocarp of annosum root rot (Heterobasidion annosum).
5367191 Schweinitzii root and butt disease Phaeolus schweinitzii Basidiocarp of velvet top fungus (Phaeolus schweinitzii) from a conifer tree.
5367190 Schweinitzii root and butt disease Phaeolus schweinitzii Basidiocarp of velvet top fungus (Phaeolus schweinitzii) on a conifer tree.
5367189 Armillaria root rots Armillaria spp. Rhizomorphs of Armillaria sp. on roots of a tree.
5367188 Armillaria root rots Armillaria spp. Mycelial fans of armillaria (Armillaria sp.) under the bark of a conifer tree.
5367187 Armillaria root rots Armillaria spp. Mycelial fans of armillaria (Armillaria sp.) under the bark of a conifer tree.
5367186 Armillaria root rots Armillaria spp. Ponderosa pine trees showing symptoms of infection with armillaria root rot (Armillaria sp.).
5367185 Armillaria root rots Armillaria spp. Mycelial fans of armillaria (Armillaria sp.) under the bark of a fir tree.
5367184 Armillaria root rots Armillaria spp. Sign / symptom of armillaria root rot (Armillaria sp.) on the branch of a tree.
5367181 lightning Lightning injury to a cottonwood tree in a neighborhood yard.
5367180 lightning Lightning injury to an elm tree in a cemetery.
5367177 sunscald Sunscald damage to the trunk of a green ash tree.
5367176 sunscald Sunscald damage to the trunk of a honey locust tree.
5367175 sunscald Sunscald damage to a mountain ash tree in a yard.
5367174 frost and winter injury (general) Branch broken on a deciduous tree, thanks to a late snowfall.
5367173 frost and winter injury (general) Frost damage to a spruce tree.
5367172 frost and winter injury (general) Frost damage to the trunk of a pear tree.
5367166 Road salt or de-icing salt Salt damage to a ponderosa pine.
5367165 Road salt or de-icing salt Salt damage to needles of a ponderosa pine.
5367164 Road salt or de-icing salt Salt damage to aspen leaves.
5366475 frost and winter injury (general) Winter injury to juniper trees in an urban setting.
5366474 frost and winter injury (general) Winter injury to conifers at timberline.
5366473 frost and winter injury (general) Winter injury to a ponderosa pine tree in an urban landscape.
5366472 frost and winter injury (general) Winter injury to a pine tree in an urban setting.
5366463 nutrient deficiency Silver maple tree exhibiting symptoms of iron chlorosis.
5366462 nutrient deficiency Silver maple tree exhibiting symptoms of iron chlorosis.
5366456 pesticides Herbicide (dicamba) damage to the trunk of a silver maple.
5366455 pesticides Herbicide damage to a pine tree in a suburban yard.
5366454 chemicals Soil sterilant damage to a tree in a suburban yard.
5366453 pesticides Herbicide damage to the trunk of a tree.
5366452 pesticides Herbicide (dicamba) damage to a sumac tree.
5366451 chemicals Soil sterilant damage to a conifer in a suburban yard.
5366450 pesticides Herbicide damage to the trunk of a honey locust tree.
5366442 Stigmina fungus Wilsonomyces carpophilus Potted chokecherry plant showing symptoms of shothole fungus, Wilsonomyces carpophilus.
5366441 Stigmina fungus Wilsonomyces carpophilus Potted chokecherry plant showing symptoms of shothole fungus, Wilsonomyces carpophilus.
5366437 powdery mildew Sphaerotheca phytoptophila Witch's broom in a hackberry tree that is afflicted with powdery mildew (Sphaerotheca phytophila).
5366436 powdery mildew Sphaerotheca phytoptophila Witch's broom in a hackberry tree that is afflicted with powdery mildew (Sphaerotheca phytophila).
5366834 brown felt blight Herpotrichia juniperi Young spruce tree showing symptoms of brown felt blight, Herpotrichia juniperi.
5366833 brown felt blight Herpotrichia juniperi Spruce tree showing symptoms of brown felt blight, Herpotrichia juniperi.
5366828 Douglas-fir needlecast Rhabdocline pseudotsugae Douglas-fir branch showing symptoms of the needlecast fungus Rhabdocline pseudotsugae.
5366827 needle cast Bifusella saccata Limber pine (Pinus flexilis) afflicted with the needlecast fungus (Hypoderma saccatum).
5366826 Elytroderma needle cast of pine Elytroderma deformans Ponderosa pine with witches' brooms and needlecast symptoms of needle cast fungus of pine (Elytroderma deformans).
5366822 apple scab Venturia inaequalis Microscope view of the conidia of apple scab (Venturia inaequalis).
5366821 apple scab Venturia inaequalis Close-up view of apple scab (Venturia inaequalis) on a crabapple leaf.
5366820 apple scab Venturia inaequalis Close-up view of apple scab (Venturia inaequalis) on a crabapple leaf.
5366819 apple scab Venturia inaequalis Apple scab (Venturia inaequalis) on crabapple.
5366818 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366817 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366815 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366814 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366813 shepherd's crook leaf and shoot blight Venturia tremulae Aspen tree severely affected by shepherd's crook leaf and shoot blight (Venturia tremulae).
5366812 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366811 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366810 shepherd's crook leaf and shoot blight Venturia tremulae Shepherd's crook leaf and shoot blight (Venturia tremulae) on aspen.
5366796 Marssonina blight of poplar Marssonina populi Close-up view of Marssonina blight (Marssonina populi) on an aspen leaf.
5366795 Marssonina blight of poplar Marssonina populi Marssonina blight (Marssonina populi) on leaves of an aspen tree.
5366792 Marssonina blight of poplar Marssonina populi Microscopic view of the conidia of Marssonina blight (Marssonina populi).
5366793 Marssonina blight of poplar Marssonina populi Microscopic view of the conidia of Marssonina blight (Marssonina populi).
5366790 Marssonina blight of poplar Marssonina populi Close-up view of Marssonina blight (Marssonina populi) on an aspen leaf.
5366791 Marssonina blight of poplar Marssonina populi Close-up view of Marssonina blight (Marssonina populi) on an aspen leaf.
5366794 Marssonina blight of poplar Marssonina populi Marssonina blight (Marssonina populi) on leaves of an aspen tree.
5366789 ink spot leaf blight Ciborinia whetzelii Signs and symptoms of ink spot leaf blight (Ciborinia whetzelii) on an aspen leaf.
5366788 ink spot leaf blight Ciborinia whetzelii Signs and symptoms of ink spot leaf blight (Ciborinia whetzelii) on an aspen leaf.
5366787 ink spot leaf blight Ciborinia whetzelii Signs and symptoms of ink spot leaf blight (Ciborinia whetzelii) on an aspen leaf.
5366786 ink spot leaf blight Ciborinia whetzelii Signs and symptoms of ink spot leaf blight (Ciborinia whetzelii) on an aspen leaf.
5366785 ink spot leaf blight Ciborinia whetzelii Signs and symptoms of ink spot leaf blight (Ciborinia whetzelii) on an aspen leaf.
5366782 sooty mold Sooty mold on a branch of elm.
5366781 Mycosphaerella fungi Mycosphaerella spp. Septoria leaf spot, Mycosphaerella sp.  (Septoria sp.), on a cottonwood leaf (Populus sp.).
5366780 Mycosphaerella fungi Mycosphaerella spp. Septoria leaf spot, Mycosphaerella sp.  (Septoria sp.).
5366779 Mycosphaerella fungi Mycosphaerella spp. Septoria leaf spot, Mycosphaerella sp.  (Septoria sp.), on the leaf of lanceleaf cottonwood (Populus angustifolia).
5366778 Mycosphaerella fungi Mycosphaerella spp. Septoria leaf spot, Mycosphaerella sp.  (Septoria sp.), on the leaf of lanceleaf cottonwood (Populus angustifolia).
5366775 Mycosphaerella fungi Mycosphaerella spp. Microscopic view of the conidia of Septoria (Mycosphaerella) species, the causative agent of septoria leaf spot.
5366776 Mycosphaerella fungi Mycosphaerella spp. Microscopic view of the conidia of Septoria (Mycosphaerella) species, the causative agent of septoria leaf spot.
5366774 Mycosphaerella fungi Mycosphaerella spp. Plains cottonwood (Populus deltoides) on the left and narrowleaf cottonwood (P. angustifolia) on the right, showing differences in susceptibility to Septoria leaf spot (Septoria sp., Mycosphaerella sp.).
5366764 unknown virus Leaf of green ash (Fraxinus pennsylvanica) showing symptoms of either Tomato Ringspot Virus or Tobacco Mosaic Virus.
5366763 unknown virus Leaf of green ash (Fraxinus pennsylvanica) showing symptoms of either Tomato Ringspot Virus or Tobacco Mosaic Virus.
5366761 mechanical Aspen tree displaying a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366762 mechanical Aspen trees displaying severe symptoms of a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366760 mechanical Aspen trees displaying a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366759 mechanical Aspen trees displaying a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366758 mechanical Aspen tree displaying a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366757 mechanical Aspen tree displaying a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366756 mechanical Aspen trees displaying a condition known as "droopy aspen." The cause is unknown but may be the result of mechanical damage to the roots.
5366755 Armillaria root rots Armillaria spp. Rhizomorphs of armillaria root rot (Armillaria sp.) on an aspen log.
5366754 Armillaria root rots Armillaria spp. Mushroom and mycelial fan characteristic of armillaria root rot (Armillaria sp.) in a conifer tree.
5366751 Armillaria root rots Armillaria spp. Subalpine fir (Abies lasiocarpa) showing symptoms of armillaria root rot (Armillaria sp.).
5366750 Armillaria root rots Armillaria spp. Ponderosa pine forest (Pinus ponderosa) with trees showing symptoms of armillaria root rot (Armillaria sp.).
5366749 Armillaria root rots Armillaria spp. Mycelial fans of armillaria root rot (Armillaria sp.) under the bark of a ponderosa pine (Pinus ponderosa).
5366748 Armillaria root rots Armillaria spp. Mycelial fans of armillaria root rot (Armillaria sp.) under the bark of a ponderosa pine (Pinus ponderosa).
5366747 Armillaria root rots Armillaria spp. Hardwood log covered with rhizomorphs of armillaria root rot (Armillaria sp.).
5366746 Armillaria root rots Armillaria spp. Young ponderosa pine trees (Pinus ponderosa) dying due to infection with armillaria root rot (Armillaria sp.).
5366745 Armillaria root rots Armillaria spp. Ponderosa pine forest (Pinus ponderosa) with trees showing symptoms of armillaria root rot (Armillaria sp.).
5366744 Verticillium wilts Verticillium spp. Silver maple tree (Acer saccharinum) showing symptoms of verticillium wilt (Verticillium sp.).
5366743 Verticillium wilts Verticillium spp. Sapwood of a maple tree showing symptoms of verticillium wilt (Verticillium sp.).
5366742 Verticillium wilts Verticillium spp. Sumac trees (Rhus sp.) showing symptoms of verticillium wilt (Verticillium sp.).
5366741 Dutch elm disease Ophiostoma ulmi Discoloration of elm wood due to the presence of Dutch elm disease (Ophiostoma ulmi).
5366740 Dutch elm disease Ophiostoma ulmi Very close-up view of the coremia (asexual fruiting structures) of Dutch elm disease (Ophiostoma ulmi).
5366739 Dutch elm disease Ophiostoma ulmi Elm tree afflicted with Dutch elm disease (Ophiostoma ulmi).
5366738 Dutch elm disease Ophiostoma ulmi Flagging of foliage in an elm tree afflicted with Dutch elm disease (Ophiostoma ulmi).
5366737 Dothiora fungus Dothiora polyspora Aspen branch showing symptoms of both Dothiora canker (Dothiora polyspora, on the right) and Cytospora canker (Cytospora sp.).
5366736 Dothiora fungus Dothiora polyspora Twigs of an aspen tree showing symptoms of infection with Dothiora canker (Dothiora polyspora).
5366735 Dothiora fungus Dothiora polyspora Damaged aspen tree showing symptoms of infection with Dothiora canker (Dothiora polyspora).
5366734 Dothiora fungus Dothiora polyspora Twigs of an aspen tree showing symptoms of infection with Dothiora canker (Dothiora polyspora).
5366733 canker and die back of Siberian Elm Tubercularia ulmea View through a microscope of the spores of Tubercularia canker (Tubercularia ulmea), a disease of Siberian elm (Ulmus pumila).
5366727 Cytospora cankers Cytospora spp. Tip dieback in an ash tree (Fraxinus sp.), caused by infection with Cytospora canker (Cytospora sp.).
5366729 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the limbs of a cottonwood tree (Populus sp.).
5366728 Cytospora cankers Cytospora spp. View through a microscope of Cytophora sp. spores, the causative agent of Cytospora canker.
5366726 Cytospora cankers Cytospora spp. Cytospora canker (Cytospora sp.) -- spore tendrils emerging from the trunk of a tree.
5366725 Cytospora cankers Cytospora spp. Cytospora canker (Cytospora sp.) -- spore tendrils emerging from the trunk of a tree.
5366724 Cytospora cankers Cytospora spp. Colorful symptoms of Cytospora canker (Cytospora sp.) on the trunk of an aspen tree (Populus tremuloides).
5366723 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the trunk of an alder.
5366718 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the branches of an apple tree.
5366722 Cytospora cankers Cytospora spp. Cytospora canker (Cytospora sp.) -- spore tendrils emerging from the trunk of a tree.
5366721 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the branches of three trees.  
5366720 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the branch of a spruce.
5366719 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the branch of a willow.
5366717 Cytospora cankers Cytospora spp. Symptoms of Cytospora canker (Cytospora sp.) on the trunk of an aspen tree (Populus tremuloides).
5366715 Thyronectria canker Thyronectria austroamericana Symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366714 Thyronectria canker Thyronectria austroamericana Close-up view of the signs and symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366713 Thyronectria canker Thyronectria austroamericana Symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366712 Thyronectria canker Thyronectria austroamericana Close-up view of symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366710 Thyronectria canker Thyronectria austroamericana Symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366709 Thyronectria canker Thyronectria austroamericana Cross-section of a honeylocust trunk showing signs of infection with both Thyronectria canker (Thyronectria austro-americana, yellow coloration) and Nectria canker (Nectria cinnabarina, dark coloration).
5366706 Thyronectria canker Thyronectria austroamericana Symptoms of Thyronectria canker (Thyronectria austro-americana) on the trunk of a honeylocust (Gleditsia triacanthos) tree.
5366707 Thyronectria canker Thyronectria austroamericana Imperfect fruiting bodies of Thyronectria canker (Thyronectria austro-americana) on honeylocust (Gleditsia triacanthos).
5366708 Thyronectria canker Thyronectria austroamericana Microscopic view of the asci of Thyronectria canker (Thyronectria austro-americana) on honeylocust (Gleditsia triacanthos).
5366696 corky bark disease Diplodia tumefaciens Gall on the side of an aspen trunk (Populus tremuloides) caused by corky bark disease (Diplodia tumefaciens).
5366697 corky bark disease Diplodia tumefaciens Galls on the side of an aspen trunk (Populus tremuloides) caused by corky bark disease (Diplodia tumefaciens).
5366695 black knot Apiosporina morbosa Branches of a chokecherry (Prunus virginiana) showing signs and symptoms of black knot canker (Apiosporina morbosa).
5366694 black knot Apiosporina morbosa Cross-section of the trunk of a chokecherry (Prunus virginiana) showing signs and symptoms of black knot canker (Apiosporina morbosa).
5366692 black knot Apiosporina morbosa Section of a chokecherry branch (Prunus virginiana) showing signs and symptoms of black knot canker (Apiosporina morbosa).
5366690 Cryptosphaeria canker Cryptosphaeria ligniota Signs and symptoms of Cryptosphaeria canker (Cryptosphaeria ligniota) on the trunk of an aspen tree (Populus tremuloides).
5366691 Cryptosphaeria canker Cryptosphaeria ligniota Signs and symptoms of Cryptosphaeria canker (Cryptosphaeria ligniota) on the trunk of an aspen tree (Populus tremuloides).
5366689 Cryptosphaeria canker Cryptosphaeria ligniota Signs and symptoms of Cryptosphaeria canker (Cryptosphaeria ligniota) on the trunk of an aspen tree (Populus tremuloides).
5366687 Cryptosphaeria canker Cryptosphaeria ligniota Signs and symptoms of Cryptosphaeria canker (Cryptosphaeria ligniota) on the trunk of an aspen tree (Populus tremuloides).
5366686 sooty-bark canker Encoelia pruinosa Apothecia of sooty-bark canker (Encoelia pruinosa) on the trunks of aspen trees (Populus tremuloides).
5366685 sooty-bark canker Encoelia pruinosa Signs and symptoms of sooty-bark canker (Encoelia pruinosa) on the trunk of an aspen tree (Populus tremuloides).
5366684 sooty-bark canker Encoelia pruinosa Apothecia of sooty-bark canker (Encoelia pruinosa) on the trunk of an aspen tree (Populus tremuloides).  
5366683 sooty-bark canker Encoelia pruinosa Close-up view of signs and symptoms of sooty-bark canker (Encoelia pruinosa) on the trunks of aspen trees (Populus tremuloides).
5366682 sooty-bark canker Encoelia pruinosa Signs and symptoms of sooty-bark canker (Encoelia pruinosa) on the trunk of an aspen tree (Populus tremuloides).
5366681 sooty-bark canker Encoelia pruinosa Close-up view of signs and symptoms of sooty-bark canker (Encoelia pruinosa) on the trunk of an aspen tree (Populus tremuloides).
5366680 Hypoxylon canker of aspen Entoleuca mammata Symptoms of hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides).
5366679 Hypoxylon canker of aspen Entoleuca mammata Close-up view of hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides).
5366678 Hypoxylon canker of aspen Entoleuca mammata Hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides).
5366677 Hypoxylon canker of aspen Entoleuca mammata Hypoxylon canker (Hypoxylon mammatum) on the trunk of an aspen tree (Populus tremuloides).
5366676 black rot Ceratocystis fimbriata Symptom of black canker (Ceratocystis fimbriata) on an aspen tree.
5366672 black rot Ceratocystis fimbriata Black canker (Ceratocystis fimbriata) on an aspen tree.
5366671 black rot Ceratocystis fimbriata Black canker (Ceratocystis fimbriata) on an aspen tree.
5366667 Siberian elm canker Botryodiplodia hypodermia Signs and symptoms of Botryodiplodia canker (Botryodiplodia hypodermia) on an elm trunk.
5366665 Endothia fungus Endothia singularis Signs and symptoms of Endothia canker (Endothia singularis) on a branch of Gambel oak (Quercus gambelii).
5366664 Endothia fungus Endothia singularis Signs and symptoms of Endothia canker (Endothia singularis) on the branch of a Gambel oak (Quercus gambelii).
5366663 Endothia fungus Endothia singularis Signs and symptoms of Endothia canker (Endothia singularis) on branches of Gambel oak (Quercus gambelii).
5356781 wetwood
5356717 sycamore anthracnose Apiognomonia veneta
5356716 sycamore anthracnose Apiognomonia veneta
5356715 Cytospora cankers Cytospora spp. Cytosporaspore tendrils on Sycamore
5356999 site selection mistakes Dr. Whitney Cranshaw (1986), inspecting poor tree placement.

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