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. |
| 22 Images of 10 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. | |
| 5044034 | Eutypella canker | Eutypella parasitica | Eutypella canker on Norway maple. |
| 5044037 | risk tree | Exposed roots and a broken bole in a hazardous lakeside tree. | |
| 5052056 | decay | Tree with green crown, but extensive decay in the bole. | |
| 5052057 | decay | Tree with a green crown, but extensive decay in the bole. | |
| 5052058 | decay | Tree with a green crown, but extensive decay in the bole. | |
| 5052059 | decay | Tree with green crown, but extensive decay in the bole. | |
| 5052060 | decay | Tree with green crown, but extensive decay in the bole. | |
| 5052061 | decay | Tree with green crown, but extensive decay in the bole. | |
| 5052062 | decay | Tree with green crown, but extensive decay in the bole. | |
| 5052063 | decay | Tree with green crown, but extensive decay in the bole. | |
| 5052083 | decay | Using an increment corer to examine a tree for decay. | |
| 5052097 | risk tree | A situation where the target could be moved. | |
| 5042076 | Armillaria root rots | Armillaria spp. | signs of armillaria visible in recent crack |
| 5298063 | deadwood and snags | Large tree with dead wood in crown, multiple burls and decay. Tom Eiber and Peggy Sand in image. | |
| 5034044 | risk tree | Western Hazard Tree Workshop participants, 2004 | |
| 5034045 | risk tree | Dissected tree at Western Hazard Tree Workshop, 2004; Dissected tree for hazard tree training | |
| 5034033 | mountains | PICUS sonic tomography for detecting decay in trees. | |
| 5048031 | branch union | A branch union with a strong, U-shaped architecture and no included bark. | |
| 5032040 | uncorrected lean | A tree that has partially failed, resulting in a severe lean. | |
| 5032041 | uncorrected lean | A tree that has partially failed, resulting in a severe lean. | |
| 5042069 | people | Al Shigo at wood pile |
