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Joseph O'Brien's Images

Title: Plant Pathologist
Organization: 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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Image Subject Name Scientific Name Description
5046023 Stigmina leaf spot Stigmina lautii Fruiting bodies (sporodochia) emerging through stomata
5040033 oak wilt Ceratocystis fagacearum
5046022 Rhabdocline needlecasts Rhabdocline spp.

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