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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 ...
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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 ...
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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 ...
Winter Injury of Landscape Plants in the Pacific Northwest R. Maleike, Extension Horticulturist, WSU Puyallup Research and Extension Center M. Ophardt, WSU Area Extension Agent, Benton-Franklin Counties S. Collman, WSU County Extension Agent (retired) ...
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Recognizing Sapsucker Damage on your Trees Kevin W. Zobrist, WSU Extension Forestry Educator A common cause of tree damage in backyards and small woodlands is from sapsuckers (Sphyrapicus spp.), which are a species of woodpecker. The Pacific Northwest has ...
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Plant Nutrition Diagnosis James Altland, former Extension Horticulturalist, OSU The only way to accurately diagnose a nutritional problem of plants is to conduct a soil test and tissue analysis at the same time. This identifies which nutrients are ...
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Key to Nutrient Deficiencies in Vegetable Crops Deficiencies producing distinct color changes in foliage. 1. Symptoms first apparent in young leaves. Element Deficient a. New leaves develop light-yellow color, first between veins. Later entire leaves ...
Key to Nutrient Deficiencies of Deciduous Fruit and Nuts Symptoms generally appear first on older leaves. (When youngest leaves are affected oldest leaves usually are falling.) Element Deficient 1. Marked “islands” of chlorosis or necrosis between main ...
Fluorine Toxicity in Plants Jay W. Pscheidt, Extension Plant Pathology Specialist, OSU Fluorine (F) occurs in the atmosphere as gaseous molecules (F 2) and in reduced form as particulate fluoride (F-). In water, inorganic fluorides usually remain in ...
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