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Effects of Seed Treatment with Fungicides and Systemic Insecticides on Stand of Cotton¹

In 1967 the insecticide, 0,0,diethyl-S-2- [(ethylthio) ethyl] phosphorodithioate (disulfoton), did not affect cotton (Gossypium hirsutum L.) seedling stands when used with the fungicide combinations of tetrachloroisophthalonitrite (chlorothalonil) + p-dimethylaminobenzenediazo sodium sulfonate (Dexon³) + 1,4-dichloro-2,5- dimethoxybenzene (chloroneb). However, it caused slight reduction of the stand when used with chlorothalonil + N-(trichloromethylthio)-4-cyclohexene-l,2-dicarboximide (captan), as compared to seed treated only with fungicides. In another test, stands from acid-delinted seeds were not affected differentially by combination seed treatments of pentachloronitrobenzene + 3-trichloromethyl-5-ethoxy-l,2,4-thiadiazole (formulated as Terracoat L21³) and any of the systemic insecticides tested. However, stands from machine-delinted seeds were lower consistently with the combined fungicide-insecticide treatments, as compared to the fungicide treatment alone. In 1968 stands were increased by seed treatment with Terracoat L21 + disulfoton, or by the multiple-fungicide treatment of Terracoat L21 + methyl mercury-2,3-dihydroxy propyl mercaptide and methyl mercury acetate (Ceresan L³), as compared to seeds treated with only Terracoat L21. When an emulsifiable formulation of Terracoat L21, as compared to the oil-base seed treatment formulation, was used for seed treatment purposes, stands from the combination treatments were reduced.

Key Words: Gossypium hirsulum L. • Chemical interactions

² Research Plant Pathologist, Plant Science Research Division, Agricultural Research Service, US Department of Agriculture in cooperation with Texas A&M University Agricultural Research and Extension Center at Lubbock, Texas.

Received for publication August 4, 1971.