Response of Peanuts to Combinations of Herbicides with Other Pesticides

Abstract

There were no apparent herbicide-insecticide or herbicide-fungicide interactions when two pesticides were used on peanuts (Arachis hypogaeaL.) in the greenhouse. In field studies, O,O-diethyls-(2-(ethylthio)-ethyl)-phosphorodithioate (disulfoton), O,O-diethyl s-((ethylthio)-methyl)-phosphorodithioate (phorate), 1,2-dibromo-3-chloropropane (dibromochloropropane), and pentachloronitrobenzene (PCNB) had little influence on phytotoxicity of the herbicides 3-amino-2,5-dichlorobenzoic acid (chloramben) andα,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine (trifluralin) to peanuts. There was no phytotoxic effect or yield reduction as a result of application of chloramben or trifluralin combined with the use of fungicide-treated seed in the field. However, in the greenhouse, top growth of the fungicide-treated checks was greater than that of the herbicide-fungicide seed treatments. Dibromochloropropane nematocide alone was injurious to peanut seedlings grown in the greenhouse, but the application of a herbicide did not increase the injury.