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Oomycetes ...
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Fungi ...
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Bacteria and Other Prokaryotes ...
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Parasitic Plants of Oregon Jay W. Pscheidt, Extension Plant Pathology Specialist, OSU Richard Halse, Herbarium Curator, OSU Kathy Merrifield, Nematologist, OSU (Update to Mistletoe section by Dave Shaw, Extension Forest Health Specialist, OSU) There are m ...
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Tree Decline M. Putnam, Director of the Oregon State University Plant Clinic Landscape tree samples often come into the OSU Plant Clinic with the complaint of a thinning canopy and premature leaf drop. Usually, samples do not have visible foliar or twig d ...
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Nonpathogenic Phenomena ...
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Mycorrhiza Cathy L. Cripps, Mycologist, Montana State University Based on the article by permission of the author: Cripps, C. 2001. Mycorrhiza. in Maloy, O. C. and Murray, T. D. 2001. Encyclopedia of Plant Pathology. Vol II. John Wiley & Sons, Inc. A ...
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Thatch in Home Lawns M. Putnam, Diagnostic Plant Pathologist, OSU T. Cook, Professor emeritus, Horticulture, OSU What Is Thatch? Thatch is a tangle of dead and living plant parts (stems, crowns, stolons, rhizomes, and roots) that accumulate below the gree ...
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Algae, Lichens, and Mosses on Plants A.D. Davison and R.S. Byther, Professors emeriti of Plant Pathology, WSU Algae, lichens, and mosses grow profusely on trunks, limbs, and twigs of many trees and shrubs. The cool, cloudy, wet weather in western Washingt ...
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Care and Maintenance of Wood Shingle and Shake Roofs Jeff Morrell, OSU, University Distinguished Professor, College of Forestry, Wood Science and Engineering. This information, updated and expanded with color images, is located: https://catalog.extension. ...