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. |
| 7 Images of 2 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5252015 | dieback | Large branch dieback in bur oak. | |
| 5049008 | dieback | White birch with crown dieback | |
| 5034087 | dieback | Decline and mortality in white birch. | |
| 5034082 | dieback | Small branch dieback in red maple in an urban landscape | |
| 5033002 | slime flux | Slime flux associated with bacterial wetwood in elm. Associated with a number of bacteria. | |
| 5033003 | slime flux | Slime flux associated with bacterial wetwood in American elm. Associatd with several species of bacteria. | |
| 5033067 | dieback | Moderate dieback in the crown of a bur oak. |
