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Effect of Fungicides on Septoria Leaf and Glume Blotch, Fusarium Scab, Grain Yield, and Test Weight of Winter Wheat. B. J. Jacobsen, Assistant Professor, Department of Plant Pathology, University of Illinois, Urbana-Champaign, IL 61801; Phytopathology 67:1412-1414. Accepted for publication 18 May 1977. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1412.

During 1974 and 1975, winter wheat yields were reduced up to 15-20% by Septoria tritici, S. nodorum, and Fusarium roseum f. sp. cerealis ‘Graminearum’ as measured by yield response to fungicides. Wheat yields were 20% higher in 1974 in plots treated with mancozeb or mancozeb plus benomyl, and 15% higher when treated with benomyl alone. Yields were increased 15% in 1975 by mancozeb plus benomyl, and by 7-11% by benomyl or MBC (methyl 2-benzimidazole-carbamate). Mancozeb or mancozeb plus benomyl gave better control of S. tritici than did benomyl or MBC. Infection of heads by S. nodorum was reduced from 57% on nonsprayed plots to 8-22% by fungicide treatments. Fusarium roseum infection of grain was reduced from 24% in nonsprayed plots, to 12% in plots treated with mancozeb plus benomyl and to 4-8% in plots treated with MBC or benomyl. Test weights were increased 1.2-2.0% by fungicide treatment in 1974.