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This article in CS

  1. Vol. 12 No. 1, p. 93-94
     
    Received: Aug 4, 1971
    Published: Jan, 1972


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doi:10.2135/cropsci1972.0011183X001200010032x

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

  1. E. B. Minton2

Abstract

Abstract

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.

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