William Jacobi's Images
Title: ProfessorOrganization: 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 |
| 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. |
