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Multiple Pest Control in Cotton with Mixtures of Selective Pesticides. Bill B. Brodie, Nematologist, ARS, USDA, Crops Research Division, Tifton, Georgia 31794, Present address of senior author: Department of Plant Pathology, Cornell University, Ithaca, New York 14850; Ellis W. Hauser, Agronomist, ARS, USDA, Crops Research Division, Tifton, Georgia 31794. Phytopathology 60:1609-1612. Accepted for publication 5 June 1970. DOI: 10.1094/Phyto-60-1609.

When we applied an 8:2:1 mixture of the nematicide aldicarb (2-methyl-2 [methylthio] propionaldehyde 0- [methylcarbamoyl] oxime) plus the soil fungicide PCNB (pentachloronitrobenzene); and the herbicide trifluralin (a,a,a-trifluro-2,6-dinitroN,N-dipropyl-p-toluidine) in the seed furrow at time of planting cotton it controlled sting nematode (Belonolaimus longicaudatus), Fusarium wilt (Fusarium oxysporum f. sp. vasinfectum), and weeds (Richardia scabra, Florida pusley, and Digitaria sanguinalis, large crabgrass). A similar mixture, in which we replaced aldicarb with 0,0-diethyl 0-p- (methylsulfinyl) phenyl phosphorothioate (B-25141), did not adequately control B. longicaudatus. There was no evidence of incompatibility among compounds. However, weed control was 7 to 22% greater when trifluralin was applied in combination with other pesticides than when applied alone. Reduction in the incidence of Fusarium wilt resulted largely from nematode control rather than from control of Fusarium wilt with PCNB. Increase in yield of cotton was closely correlated with control of B. longicaudatus and Fusarium wilt.

Additional keywords: disease complex.