Abstract
Disease reactions and effects on yield caused by Helminthosporium [carbonum] leaf spot (HLS), northern corn leaf blight (NCLB) [H. turcicum], southern corn leaf blight (SCLB-T) [H. maydis race T) and (SCLB-O) [H. maydis race O] on 20 corn [Zea mays] 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.

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