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John W. Schwandt's Images

Title: Plant Pathologist
Organization: USDA Forest Service
Unit: Forest Health Protection - Coeur d’Alene Field Office
Country: United States
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11 Images of 6 Subjects View Subject List View Image Details View Thumbnails

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Image Subject Name Scientific Name Description
1241567 Rhabdocline needlecasts Rhabdocline spp. Rhabdocline apothecia are released when flaps of leaf epidermis fold back on either side of the midrib.
1241566 Rhabdocline needlecasts Rhabdocline spp. Rhabdocline apothecia are released when flaps of leaf epidermis fold back on either side of the midrib.
1241616 pine needle cast Lophodermium nitens Lophodermium nitens has caused severe defoliation in this western white pine.
1241588 needle blight of larch Meria laricis Larch needle cast causes yellow spots which become red-brown, begins infecting emerging needles in the spring, and can continue to reinfect as long as rainfall creates suitable conditions.
1241565 Rhabdocline needlecasts Rhabdocline spp. Red spots and transverse banding on infected needles.
1241666 root diseases and rots A cluster of young Douglas-fir and grand fir have been killed by root disease near this old stump.
1241717 white pine blister rust Cronartium ribicola Wetting branch cankers can make it easier to see the discoloration from a canker.
1241724 western gall rust Endocronartium harknessii Branch flagging in crown caused by western gall rust.
1241662 root diseases and rots A stress cone crop produced on a tree with thinning foliage and shortened terminal growth is an indication of root disease.
1241654 root diseases and rots Root disease is often easily recognized from afar. Changes in tree density and clusters of young trees or brush assocaiated with tree mortality are good indicators of root disease.
1241718 white pine blister rust Cronartium ribicola Branch flagging occurs after the canker has girdled the branch.

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