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New Concepts in Chemical Seed Treatment of Agronomic Crops¹

ABSTRACT

The presence of Helminthosporium maydis Nisik. & Miyaka race T in corn (Zea mays L.) seed reduced germination and vigor of the seedlings. Ten percent of the seedlings damped-off in soil in a growth room. Treating seed with Vitavax (5, 6-dihydro-2-methyl-1, 4-oxathiin-3-carboxanilide) and Vitavax-Thiram (Tetramethylthiurum disulfide) reduced the activity of H. maydis in the seed. Benomyl [Methyl 1(butylcarbamoyl)-2-benzimidazolecarbamate] and thiobendazole [2(4-thiazolyl)-benzimidazole] arrested Fusarium moniliforme Sheldon infection in corn seed. Mixtures of Vitavaxthiram and benomyl were effective in controlling both species of fungi in seed.

Key Words: Helminthosporium maydis • race T • Fusarium moniliforme • Vitavax • Benomyl • seed treatment • fungal mycoplasma.

¹ Paper presented before Div. C-4, Aug. 18, 1971, in New York City atthe annual meeting of the ASA as part of the symposium "Fungicide Treatment, Packaging, and Vigorof Seeds."

² Research Plant Pathologist, Plant Science Research Division, Agricultural Res. Serv., USDA in cooperation with the Mississippi Agricultural & Forestry Exp. Sta., State College, MS 39762.

Received for publication October 19, 1971.