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Disease Detection and Losses

Leaf Infection and Yield Loss Caused by Four Helminthosporium Leaf Diseases of Corn. D. E. Fisher, Assistant Plant Pathologist, Department of Plant Pathology, Illinois Agricultural Experiment Station, Urbana, IL 61801; A. L. Hooker(2), S. M. Lim(3), and D. R. Smith(4). (2)(3)(4)Professor, Assistant Professor, and former Assistant Plant Pathologist, (now Plant Pathologist, DeKalb Agricultural Research, Inc., DeKalb, IL 60115), respectively, Department of Plant Pathology, Illinois Agricultural Experiment Station, Urbana, IL 61801. Phytopathology 66:942-944. Accepted for publication 3 February 1976. Copyright © 1976 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-66-942.

Disease reactions and effects on yield caused by Helminthosporium leaf spot (HLS), northern corn leaf blight (NCLB), southern corn leaf blight (SCLB-T) and (SCLB-O) on 20 corn hybrids were determined in the field. Overall yields were reduced least by HLS and most by SCLB-T. Mean equivalent yield had a significant negative correlation with percentage leaf area blighted by NCLB, SCLB-T, and SCLB-O, but not by HLS.