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. |
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| 37 Images of 6 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5302004 | white pine blister rust | Cronartium ribicola | Inoculating white pine with Cronartium ribicola in the lab |
| 5302005 | white pine blister rust | Cronartium ribicola | Inoculating white pine with Cronartium ribicola in the lab |
| 5302009 | white pine blister rust | Cronartium ribicola | Symptomatic white pine seedlings being screened for blister rust resistance |
| 5302008 | white pine blister rust | Cronartium ribicola | Greenhouse trials for white pine blister rust screening |
| 5041093 | Diplodia blight | Sphaeropsis sapinea | Marking trees to track shoot blight impacts |
| 5041094 | red pine | Pinus resinosa | Marking branches to track shoot blight impacts |
| 5056094 | white pine blister rust | Cronartium ribicola | White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard. Ribes plants used for cultivating Cronartium spores. |
| 5056088 | white pine blister rust | Cronartium ribicola | White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard |
| 5056089 | white pine blister rust | Cronartium ribicola | White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard |
| 5056090 | white pine blister rust | Cronartium ribicola | White pine blister rust inoculation trials at U.S. Forest Service Oconto River Seed Orchard |
| 5299087 | white heartwood rot | Phellinus tremulae | Aspen sections used in a study on white trunk rot in aspen |
| 5299088 | white heartwood rot | Phellinus tremulae | Aspen sections used in a study on white trunk rot in aspen |
| 5299089 | white heartwood rot | Phellinus tremulae | Examining aspen sections for a study on white trunk rot of aspen |
| 5050092 | Diplodia blight | Sphaeropsis sapinea | Red pine tagged for a study on shoot blight caused by Diplodia pinea |
| 5050093 | Diplodia blight | Sphaeropsis sapinea | Setting up research plots for shoot blight caused by Diplodia pinea. |
| 5050099 | Diplodia blight | Sphaeropsis sapinea | Young red pine stand affected by Diplodia shoot blight. |
| 5051006 | Diplodia blight | Sphaeropsis sapinea | Diplodia shoot blight symptoms in young red pine on a poor site. Shane Weber |
| 5051008 | Diplodia blight | Sphaeropsis sapinea | Diplodia shoot blight in a young red pine plantation on a poor site. |
| 5051025 | Diplodia blight | Sphaeropsis sapinea | Setting up Diplodia shoot blight impact plots in a young red pine stand. |
| 5049007 | chestnut blight or canker | Cryphonectria parasitica | Research activities concerning chestnut blight. Person in image: Bill MacDonald |
| 5297089 | American chestnut | Castanea dentata | Collecting chestnut fruits for blight research in Minnesota.; Person in image: Charlie Burnham and Peter Bedker. |
| 5297090 | American chestnut | Castanea dentata | Collecting chestnut fruits for chestnut blight research in Minnesota. Person in image:Peter Bedker |
| 5297091 | American chestnut | Castanea dentata | Collecting chestnut fruits for chestnut blight research in Minnesota. Person in image: Charlie Burnham and Peter Bedker |
| 5297092 | chestnut blight or canker | Cryphonectria parasitica | Experimental treatment of chestnut blight cankers in Wisconsin. Person in image:Linda Haugen |
| 5297093 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing chestnut blight research in Wisconsin. |
| 5297094 | chestnut blight or canker | Cryphonectria parasitica | Chestnut blight cankers experimentally treated with hypovirulent strain of the pathogen. |
| 5297095 | chestnut blight or canker | Cryphonectria parasitica | Chestnut blight cankers experimentally treated with a hypovirulent strain of the pathogen. |
| 5297096 | chestnut blight or canker | Cryphonectria parasitica | Chestnut blight research in Wisconsin. Person in image: Barb Spears |
| 5297097 | chestnut blight or canker | Cryphonectria parasitica | Chestnut blight cankers experimentally treated with a hypovirulent strain of the pathogen. |
| 5297098 | chestnut blight or canker | Cryphonectria parasitica | Farm site in Wisconsin where chestnut blight cankers were experimentally treated with a hypovirulent strain of the pathogen. |
| 5298001 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing research on chestnut blight in Wisconsin. |
| 5298002 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing research on chestnut blight in Wisconsin. |
| 5298003 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing research on chestnut blight in Wisconsin. |
| 5298006 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing research on chestnut blight in Wisconsin. |
| 5298007 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing research on chestnut blight in Wisconsin. |
| 5298008 | chestnut blight or canker | Cryphonectria parasitica | Field crew doing research on chestnut blight in Wisconsin. |
| 5298009 | chestnut blight or canker | Cryphonectria parasitica | Tree climbing field crew doing research on chestnut blight in Wisconsin. |
