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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| 19 Images of 2 Subjects | View Subject List | View Images Details | View Thumbnails |
| 19 Images |
 1301078 Dutch elm disease Ophiostoma ulmi Sign Joseph O'Brien |
 1301076 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 1301074 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 1301073 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5252020 Dutch elm disease (novi-ulmi) Ophiostoma novo-ulmi Fruiting Bodies Joseph O'Brien |
 5033090 Dutch elm disease (novi-ulmi) Ophiostoma novo-ulmi Control Joseph O'Brien |
 5033086 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5029008 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5029009 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5039091 Dutch elm disease Ophiostoma ulmi Asexual Spore Joseph O'Brien |
 5038038 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5038044 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5033081 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5033082 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5033083 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5033084 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5033085 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5033075 Dutch elm disease Ophiostoma ulmi Symptoms Joseph O'Brien |
 5037070 Dutch elm disease Ophiostoma ulmi Tree(s) Joseph O'Brien |
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