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 4 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5035024 | oak decline | Oak tree stumps in a campground. These trees died from the interaction of drought, twolined chestnut borer and Armillaria root rot. | |
| 5051040 | Diplodia blight | Sphaeropsis sapinea | Removing tops of red pine in a seed tree or sheltewood cut can eliminate infection of advance regeneration from spores produced in the overstory trees. |
| 5043051 | static tree support | Placing stabilizing cables in a red oak. | |
| 5034074 | log deck | Sprinklers to keep logs wet to prevent checking | |
| 5034075 | log deck | Sprinklers to keep logs in deck wet to prevent checking | |
| 5034076 | log deck | Sprinklers to keep log deck wet to prevent checking |
