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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Physiological Disorders(X)
| 36 Images of 3 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 1198008 | iron deficiency | Chlorosis caused by iron deficiency | |
| 1198012 | oak tatters | Severely deformed leaves are the characteristic symptom of this problem. Herbicide drift has been implicated as the cause of oak tatters. | |
| 1198013 | oak tatters | Characteristic shredded appearance of bur oak leaves formed early in the season. | |
| 1198011 | oak tatters | Recent research has shown that oak tatters is probably caused by herbicide drift. Leaves affected by this syndrome have a shredded or tattered appearance. | |
| 5030060 | iron deficiency | Chlorosis and dieback from iron deficiency. | |
| 5039050 | nutrient deficiency | chlorotic leaves | |
| 5045078 | oak tatters | ||
| 5056069 | oak tatters | ||
| 5056070 | oak tatters | ||
| 5056071 | oak tatters | ||
| 5056073 | oak tatters | ||
| 5056074 | oak tatters | ||
| 5056076 | oak tatters | ||
| 5056077 | oak tatters | ||
| 5056078 | oak tatters | ||
| 5056079 | oak tatters | ||
| 5056080 | oak tatters | ||
| 5056082 | oak tatters | ||
| 5056083 | oak tatters | ||
| 5056084 | oak tatters | ||
| 5056085 | oak tatters | ||
| 5054046 | iron deficiency | iron chlorosis | |
| 5054047 | iron deficiency | iron chlorosis | |
| 5054048 | iron deficiency | iron chlorosis | |
| 5054049 | iron deficiency | iron chlorosis | |
| 5054052 | iron deficiency | iron chlorosis | |
| 5054053 | iron deficiency | iron chlorosis | |
| 5054054 | iron deficiency | iron chlorosis | |
| 5054055 | iron deficiency | iron chlorosis | |
| 5054056 | iron deficiency | iron chlorosis | |
| 5054057 | iron deficiency | iron chlorosis | |
| 5054058 | iron deficiency | iron chlorosis | |
| 5054059 | iron deficiency | iron chlorosis | |
| 5054060 | iron deficiency | iron chlorosis | |
| 5054061 | iron deficiency | iron chlorosis | |
| 5054062 | iron deficiency | iron chlorosis |
