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Resistance

Identification of Sorghum Downy Mildew Resistance in Corn by Leaf Reaction to Conidial Inoculum. Jeweus Craig, Research plant pathologist, Agricultural Research Service, U.S. Department of Agriculture, Plant Sciences Department, Texas A&M University, College Station 77843; Phytopathology 72:351-352. Accepted for publication 29 June 1981. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1982. DOI: 10.1094/Phyto-72-351.

Ten corn inbred lines were compared for symptoms on leaves inoculated with conidia of Peronosclerospora sorghi in the greenhouse and for susceptibility to sorghum downy mildew in the field. A classification system for leaf symptoms was devised. The correlation between leaf symptom types in the greenhouse and levels of downy mildew susceptibility in the field was calculated to determine the feasibility of using leaf reactions to predict levels of downy mildew susceptibility. Degree of severity of leaf symptoms was positively and significantly (P = 0.01) correlated with degree of downy mildew susceptibility.