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Control of Ustilago striiformis and Urocystis agropyri in Poa pratensis by Thiophanate Fungicides. John R. Hardison, Plant Pathologist, Plant Science Research Division, ARS, USDA, and the Department of Botany and Plant Pathology, Oregon Agricultural Experiment Station, Corvallis 97331; Phytopathology 61:1462-1464. Accepted for publication 14 July 1971. DOI: 10.1094/Phyto-61-1462.

Thiophanate-methyl, 1,2-bis(3-methoxycarbonyl-2-thioureido) benzene, applied at 160 mg/600 ml soil in the root zone, eradicated Ustilago striiformis (stripe smut) in small diseased plants of Poa pratensis ‘Merion’, but at 160 mg this chemical produced incomplete control of Urocystis agropyri (flag smut). Thiophanate, 1,2-bis(3-ethoxycarbonyl-2-thioureido) benzene, was virtually inactive against both smuts. No apparent control of Puccinia striiformis (stripe rust) in Merion Kentucky bluegrass plants resulted from applications of either chemical at 10-160 mg/160 ml soil.