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. |
| 15 Images of 8 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 1397039 | topping | Poor maintenance practice | |
| 5038080 | risk tree | Tree with large defect caused by failed codominant branch. | |
| 5045010 | risk tree | Large broken branches in silver maple | |
| 5045009 | risk tree | Codominant branch failure in bur oak | |
| 5043044 | branch union | Strong branch attachment in bur oak. | |
| 1397114 | pruning (general) | young tree in need of pruning | |
| 1397122 | pruning (general) | Excessive branch crossing. Tree needs a thinning cut. | |
| 5033039 | storm damage (general) | Tree damaged by high winds | |
| 5033093 | epicormic branch | Epicormic branches arising after pruning in green ash. | |
| 5043088 | urban planting | Note the rope still surrounding the base of the tree. This should have been removed when the tree was planted. | |
| 5043091 | pruning (general) | Properly pruned tree, with a closed pruning wound. Also shows a strong, u-shaped branch crotch. | |
| 1397136 | pruning (general) | proper cut | |
| 1397115 | pruning (general) | Proper pruning cut on small branch. | |
| 5061024 | human caused injury | severe weed wacker damage | |
| 5061025 | human caused injury | weed whacker damage |
