Use of Systemic Fungicides Metalaxyl and Fosetyl-Al for Control of Sorghum Downy Mildew in Corn and Sorghum in South Texas. II: Foliar Application. G. N. Odvody, Assistant Professor, Texas A&M Research and Extension Center, Route 2, Box 589, Corpus Christi 78410. R. A. Frederiksen, Professor, Plant Sciences Department, Texas A&M University, College Station 77843. Plant Dis. 68:608-609. Accepted for publication 1 February 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-608.

Metalaxyl was an effective curative of sorghum downy mildew when applied to foliage of systemically infected corn (Zea mays) and sorghum (Sorghum bicolor) at rates of either 0.96 or 4.8 mg a.i./ml. Phytotoxicity of metalaxyl to corn and sorghum foliage was dependent on fungicide rate and plant age. Fosetyl-Al was an apparent but limited curative of sorghum downy mildew on sorghum when applied to foliage at a rate of 8.00 mg a.i./ml.