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. |
| 6 Images of 5 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5050084 | visual tree inspection | Inspecting a potential hazard tree at Grey Towers, near handicap parking space. | |
| 5051051 | wood decay | Examining dissected tree for decay | |
| 5048072 | beech bark disease | Nectria coccinea | Examining a snapped beech affected by beech bark disease. People in image: Roger Mech, MI DNR; Manfred Mielke, USFS |
| 5042070 | sudden oak death | Phytophthora ramorum | Inspection of nursery infected with Phytophthora ramorum on Rhododendron. |
| 1397114 | pruning (general) | young tree in need of pruning | |
| 1397122 | pruning (general) | Excessive branch crossing. Tree needs a thinning cut. |
