Joseph O'Brien's Images
Title: Plant PathologistOrganization: USDA Forest Service
Unit: Forest Health Protection
Country: United States
Joe is a plant pathologist with the U.S. Forest Service in St. Paul, Minnesota. in addition to photography, his major interests include tree diseases in forests, woodlands and urban areas, hazard tree identification and mitigation, and mycology. Joe is a graduate of the University of Michigan (B.S. Forestry and M.S. Forest Pathology) and the University of Minnesota (Ph.D. Plant Pathology), and currently works at the Northern Research Station on the University of Minnesota's St. Paul campus. |
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| 2,549 Images of 443 Subjects | View Subject List | View Image Details | View Thumbnails |
| 2549 Images |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5033076 | deer | Deer vertebra found on forest floor. | |
| 5047063 | fly agaric | Amanita muscaria | with dime for scale |
| 5034023 | white spruce | Picea glauca | healthy foliage |
| 5034024 | white spruce | Picea glauca | healthy foliage |
| 5034025 | white spruce | Picea glauca | healthy foliage |
| 5027094 | Armillaria root rots | Armillaria spp. | Armillaria spp. often produce abundant quantities of white spores. |
| 1427028 | sudden oak death | Phytophthora ramorum | China Camp State Park, California |
| 5046011 | California white oak | Quercus lobata | |
| 5032004 | building | McNeil Hall; University of Minnesota | |
| 5035081 | spruce decline | Declining spruce | |
| 1397039 | topping | Poor maintenance practice | |
| 1427068 | sudden oak death | Phytophthora ramorum | Dried ooze caused by bleeding from P. ramorum infection on coast live oak. |
| 1427003 | sudden oak death | Phytophthora ramorum | |
| 1427001 | sudden oak death | Phytophthora ramorum | |
| 1427054 | sudden oak death | Phytophthora ramorum | Canker and zone lines caused by P. ramorum. |
| 1301078 | Dutch elm disease | Ophiostoma ulmi | Coremia (spore-bearing bodies) of Ophiostoma ulmi in a Scolytus multistriatus gallery |
| 1301077 | American elm | Ulmus americana | Street lined with mature, healthy American elm. |
| 1301053 | Diplodia blight | Sphaeropsis sapinea | Sphaeropsis sapinea branch infections on red pine following a hail storm on a dry site. |
| 1301060 | Eutypella canker | Eutypella parasitica | |
| 1397048 | wind | Trees and limbs cut and stacked in a neighborhood affected by high winds. | |
| 1397097 | human caused injury | "lantern canker", Shawnee National Forest | |
| 1301033 | oak wilt | Ceratocystis fagacearum | Oak wilt in a young group of pin oaks |
| 1301076 | Dutch elm disease | Ophiostoma ulmi | Crown symptoms of Dutch elm disease on a large street tree. |
| 1301069 | northern tooth | Climacodon septentrionalis | |
| 1427095 | sudden oak death | Phytophthora ramorum | Coast live oak mortality from P. ramorum infection at China Camp State Park, CA. |
| 1427071 | sudden oak death | Phytophthora ramorum | Coast live oak dying from P. ramorum infection, China Camp State Park, CA. |
| 1427052 | sudden oak death | Phytophthora ramorum | Tanoak dying from P. ramorum infection, Muir Woods State Park, CA. |
| 1427048 | sudden oak death | Phytophthora ramorum | Tanoak dying from P. ramorum infection, Muir Woods State Park, CA. |
| 1427050 | sudden oak death | Phytophthora ramorum | Tanoak sprouts dying from P. ramorum infection. |
| 1427046 | sudden oak death | Phytophthora ramorum | |
| 1427047 | sudden oak death | Phytophthora ramorum | Tip dieback caused by P. ramorum on tanoak. |
| 1427034 | sudden oak death | Phytophthora ramorum | |
| 1427035 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427041 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427020 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427021 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1377024 | annosum root disease | Heterobasidion annosum | Small conks ("popcorn conks")of Heterobasidion annosum in the duff at the base of an eastern white pine. |
| 1427023 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427019 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427004 | sudden oak death | Phytophthora ramorum | |
| 1397098 | birch | Betula spp. | |
| 1198002 | Neonectria canker | Neonectria galligena | on birch |
| 1377028 | eastern pine gall rust | Cronartium quercuum | Several clustered galls |
| 1397020 | Appalachian barren strawberry | Waldsteinia fragarioides | |
| 1427016 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427109 | sudden oak death | Phytophthora ramorum | |
| 1301046 | emerald ash borer | Agrilus planipennis | |
| 1427022 | sudden oak death | Phytophthora ramorum | Big Sur, California |
| 1427051 | sudden oak death | Phytophthora ramorum | Tanoak sprouts dying from P. ramorum infection. |
| 1198008 | iron deficiency | Chlorosis caused by iron deficiency | |
| 1377014 | carbon balls | Daldinia concentrica | |
| 1198019 | blue stain | Chlorociboria aeruginascens | Saprophytic on well-decayed wood. Stains wood blue-green. The small sporocarps shown here are rarely seen. |
| 1198026 | canker rot | Cerrena unicolor | Thin flexible sporocarps usually have an upper surface covered by algae. |
| 1301065 | northern tooth | Climacodon septentrionalis | |
| 1427080 | sudden oak death | Phytophthora ramorum | Tanoak dying from P. ramorum infection, Muir Woods State Park, CA. |
| 1427096 | sudden oak death | Phytophthora ramorum | Tanoak dying from P. ramorum infection at Muir Woods. |
| 1427049 | sudden oak death | Phytophthora ramorum | Tanoak dying from P. ramorum infection. |
| 1427110 | sudden oak death | Phytophthora ramorum | |
| 1397021 | jack pine | Pinus banksiana | |
| 1397023 | Indianpipe | Monotropa uniflora |
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