Control of Several Cotton Insects in Field Experiments in 1960

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Abstract
Dusts or sprays of toxaphene plus DDT or Strobane plus DDT were equally effective against the boll weevil (Anthonomus grandis Boheman) and the bollworm (Heliothis zea (Boddie)). Geigy 30494, or Bayer 29493, Shell SD-5539, and Shell SD-5533 gave fair-to-good con-trol of the boll weevil but none of these materials were as effective as Guthion. Shell SD-4402 plus methyl parathion gave bollworm control equal to that obtained with endrin plus DDT. Am. Cyanamid 24055 Anti-feeding Compound showed promise for control of the bollworm. Bayer 29493 and Bayer 30911 were ineffective against this pest. Methyl Trithion plus DDT was ineffective against the cabbage looper (Trichoplusiani (Hubner)) when used in a regular schedule of applications for the control of the boil weevil and bollworm. Geigy 30494, Geigy 36368, Bayer 29493, Shell SD-5533, or Shell SD-5539 were effective against the cotton leafworm (Alabama argillacea (Hubner)). Am. Cyanamid 24055 was also effective against this pest but kill was slow. Bayer 30911 was ineffective. The chemical definitions of the insecticides with proprietary names mentioned above are as follows Strobane (a mixture of chlorinated terpenes with about 66% of chlorine), Geigy 30494 (O, O-dimethyl S-(2,5-dichlorophenylmercaptomethyl phosphorodithioate), Bayer 29493 (O, O-dimethyl O-[4) methylthio)-m-tolyl] phosphorothioate), Shell SD-5539 (dimethyl 1-(m-nitrobenzyloxycarbonyl)-1-propen-2-yl phosphate), Shell SD-5533 (dimethyl 1-(p-nitrobenzyloxycarbonyl)-1 propen-2-yl-phosphate), Shell SD-4402 (1, 3, 4, 5, 6, 7, 8, 8-octachloro-3[alpha], 4, 7, 7[alpha]-tetrahydro-4, 7-methanophthalan), Methyl Trithion (S-[(p-chlorophenylthio)methyl] O, O-dimethyl phosphorodithioate), Bayer 30911 (O-(2,4-dichlorophenyl) O-methyl methylphosphonothioate), Guthion (O, O-dimethyl S-(4-oxo-1, 2,3-benzotriazin-3-(4H)-ylmethyl) phosphorodithioate), Geigy 36368 (a mixture of Geigy 30494 and Geigy 30493 (S-(3,4-dichlorophenylthio) methyl O, O-dimethyl phosphorodithioate) in the ratio of approximately 1:3), Am. Cyanamid Anti-feeding compound 24055 (4''-(dimethyltriazeno) acetanilide).