Field Experiments for Control of Thrips, Cotton Fleahoppers, and Overwintered Boll Weevils in 1960

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Abstract
Sevin, Geigy 30494, toxaphene, Strobane, and toxaphene plus DDT were equally effective against thrips (Frankliniella spp.). Toxaphene plus DDT gave significantly better control of the cotton fleahopper (Psallus seriatus (Reuter)) than toxaphene alone or Strobane. Bayer 29493 gave good control of this pest, Shell SD-4402 poor control, and Geigy 30494 was ineffective. Good kills of overwintered boll weevils (Anthonomus grandis Boheman) were obtained with Shell Compounds SD-5539 and SD-5533, Geigy 30494, Methyl Trithion, and Bayer 29493. Bayer 30911 was ineffective. Am. Cyanamid Anti-feeding Compound 24055 was ineffective against thrips, the cotton fleahopper, and overwintered boll weevils. The chemical definitions of the insecticides with proprietary names mentioned above are: Strobane (a mixture of chlorinated terpenes with about 66% of chlorine); Sevin (1-naphthyl N-methylcarbamate); Geigy 30494 (O, O-dimethyl S-(2, 5-dichlorophenylthio) methyl phosphorodithioate); Bayer 29493 (O, O-dimethyl O-(4-methylthio-m-tolyl) phosphorothioate); Shell SD-4402 (1, 3, 4, 5, 6, 7, 8, 8-octachloro-3[alpha], 4, 7, 7[alpha]-tetrahydro-4, 7-methanoph-thalan); Shell SD-5539 (dimethyl 1-(m-nitrobenzyloxycarbonyl)-1-propen-2-yl phosphate); Shell SD-5533 (dimethyl 1-(p-nitrobenzyloxy-carbonyl)-1-propen-2-yl phosphate); Methyl Trithion (S-(p-chloro-phenylthio) methyl O, O-dimethyl phosphorodithioate); Bayer 30911 (O-(2,4-dichlorophenyl) O-methyl methylphosphonothioate); Am. Cyanamid Anti-feeding Compound 24055 (4''-dimethyltriazeno) acetanilide).