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Effect of fungicides applied singly and in combination on seed yield and three leaf spot diseases in orchardgrass



Effect of fungicides applied singly and in combination on seed yield and three leaf spot diseases in orchardgrass



Plant Disease 75(10): 1004-1008



Leaf diseases caused by Mastigosporium rubicosum (cause of eyespot), Rhynchosporium orthosporum (cause of scald), and Cercosporidium graminis (cause of leaf streak) were identified on orchardgrass (Dactylis glomerata) growth for seed. Fungicides (captafol, chlorothalonil, and propiconazole) were applied up to three times per year to plants in different stages of growth for 5 yr (1o84-1988). Leaf area damaged by diseases (primarily scald) ranged from moderate to severe depending on the yearly variation in precipitation. In wet years, seed yields were significantly larger (P = 0.05) in plots treated with chlorothalonil than nontreated controls. Scores for leaf area damaged by disease in plots treated with chlorothalonil (when significantly different from controls) were inversely related to seed yield.

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Accession: 002082661

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