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. |
| 14 Images of 2 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5053062 | beech scale | Cryptococcus fagisuga | Heavy infestation of Cryptococcus fagisuga scale on American beech |
| 5048083 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5048065 | beech scale | Cryptococcus fagisuga | Cottony coverings of Cryptococcus fagisuga, the beech scale. |
| 5048076 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5048079 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5048095 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5048086 | beech scale | Cryptococcus fagisuga | Beech bark disease. A severe infestation of Cryptococcus fagisuga in Ludington State Park, MI. |
| 5048096 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5048097 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5049001 | beech scale | Cryptococcus fagisuga | Cryptococcus fagisuga on American beech. |
| 5050024 | cooley spruce gall adelgid | Adelges cooleyi | |
| 5050025 | cooley spruce gall adelgid | Adelges cooleyi | |
| 5050026 | cooley spruce gall adelgid | Adelges cooleyi | |
| 5050027 | cooley spruce gall adelgid | Adelges cooleyi |
