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. |
| 30 Images of 9 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5047019 | eastern white pine | Pinus strobus | A mature eastern white pine |
| 5047030 | white spruce | Picea glauca | A white spruce branch covered with hoarfrost |
| 5041094 | red pine | Pinus resinosa | Marking branches to track shoot blight impacts |
| 5046019 | red pine | Pinus resinosa | A typical horizontal branch in red pine |
| 5040073 | red pine | Pinus resinosa | Planted red pine seedlings |
| 5040074 | red pine | Pinus resinosa | Planted red pine seedligns |
| 5038063 | eastern white pine | Pinus strobus | White pine on the shoreline of Katherine Lake, in the Sylvania Wilderness area of the Ottawa National Forest. |
| 5252004 | pine | Pinus spp. | Chinese forestry worker with plantation pine |
| 5034067 | eastern white pine | Pinus strobus | A large white pine at the headquarters of the Apostle Islands National Lakeshore office |
| 5040075 | red pine | Pinus resinosa | Pole-sized stand of red pine. |
| 5040076 | red pine | Pinus resinosa | Red pine shelterwood stand with natural regeneration below. Red pine seed tree-shelterwood regeneration. The regenerating pine in these kinds of stands are at risk of failure due to Diplodia pinea. |
| 5040069 | red pine | Pinus resinosa | Male strobili of red pine. |
| 5040077 | red pine | Pinus resinosa | Regenerating red pine stand under a shelterwood cut. |
| 5031004 | red pine | Pinus resinosa | |
| 5031041 | red pine | Pinus resinosa | candles (new shoots) |
| 5030029 | tamarack | Larix laricina | Cones and emerging needles of tamarack. |
| 5027036 | balsam fir | Abies balsamea | |
| 5027037 | balsam fir | Abies balsamea | |
| 5027038 | balsam fir | Abies balsamea | |
| 5037058 | white spruce | Picea glauca | healthy foliage |
| 5056008 | mugo pine | Pinus mugo | pruned tree |
| 5054080 | jack pine | Pinus banksiana | |
| 5034054 | jack pine | Pinus banksiana | |
| 5034055 | jack pine | Pinus banksiana | |
| 5034056 | jack pine | Pinus banksiana | |
| 5038064 | eastern white pine | Pinus strobus | |
| 5042014 | eastern arborvitae | Thuja occidentalis | |
| 5042015 | eastern arborvitae | Thuja occidentalis | |
| 5042016 | eastern arborvitae | Thuja occidentalis | |
| 5040061 | red pine | Pinus resinosa |
