Effects of Seed Treatment with Fungicides and Systemic Insecticides on Stand of Cotton1
- E. B. Minton2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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