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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| 13 Images of 2 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 1198009 | eye spot | Phyllosticta minima | This image shows spots that are more purple than usual. Often the center of the lesion falls out, resulting in the shot-hole symptom that is common with this disease. |
| 5055075 | eye spot | Phyllosticta minima | Phyllosticta leaf spot |
| 5028006 | Diplodia tip blights | Diplodia spp. | Diplodia shoot blight in red pine after a hailstorm. |
| 5028004 | Diplodia tip blights | Diplodia spp. | Austrian pine is very susceptible to Diplodia tip blight in the Midwest. |
| 5057073 | eye spot | Phyllosticta minima | |
| 5057074 | eye spot | Phyllosticta minima | |
| 5057075 | eye spot | Phyllosticta minima | |
| 5057076 | eye spot | Phyllosticta minima | |
| 5057077 | eye spot | Phyllosticta minima | |
| 5057079 | eye spot | Phyllosticta minima | |
| 5057080 | eye spot | Phyllosticta minima | |
| 5057082 | eye spot | Phyllosticta minima | |
| 5057083 | eye spot | Phyllosticta minima |
