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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) Fac ...
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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 deficie ...
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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 beco ...
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 la ...
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 solut ...
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Pesticide Articles ...
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Fungicide Resistance and Fungicide Groups J.W. Pscheidt, Extension Plant Pathology Specialist, OSU Fungicide resistance is a major threat to disease control. Resistance is common among many plant pathogenic fungi throughout the PNW. Many new fungicides ar ...
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Fungicide and Pollen Interactions J.W. Pscheidt, Extension Plant Pathology Specialist, OSU Do fungicides inhibit pollen? Yes, but mostly in the laboratory. Fungicides do not inhibit fruit set and yield. Several fungicides inhibit pollen germination. This ...
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Materials Allowed for Organic Disease Management Can I Use This Product on My Organic Farm? Nick Andrews, Small Farms Extension (OSU) 1 1 Reviewed by Brian Baker (Organic Materials Review Institute), John Stalley (Oregon Tilth, Inc.) and Katherine Withey ...
Fungicidal Activity and Nutritional Value of Phosphorous Acid Asha M. Brunings, Guodong Liu, Eric H. Simonne, Shouan Zhang, Yuncong Li, and Lawrence E. Datnoff Adapted from original article: Brunings, A.M., Liu, G, Simonne, E.H., Zhang, S., Li, Y., and Da ...
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