Field Experiments Against Several Late-Season Cotton Insects in 19591

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Abstract
Strobane-DDT was as effective against the boll weevil (Anthonomus grandis Boh.) and the bollworm (Heliothis zea (Boddie)) as toxaphene-DDT. Guthion-DDT gave better control of the boll weevil than Shell SD-3562 and Shell SD-4402 but was no better than Shell SD-5539-DDT. Sevin gave better boll weevil control than Geigy G-30494-DDT but it was not better than Bayer 25141. There was no difference in boll weevil and bollworm control obtained with Sevin applied in a dust or in a wettable powder formulation. Shell SD-4402 was effective against bollworms but Shell SD-3562 was ineffective. Bayer 25141 at dosages used was less effective than standard materials. There was no difference in control of the cotton aphid (Aphis gossypii Glov.) and the desert spider mite (Tetranychus desertorum Banks) with demeton, ethion, Trithion, Bayer 25141, Shell SD-3562 and Geigy G-30494. Sevin, Shell SD-3562, and Shell SD-4402 were as effective as methyl parathion against the cotton leafworm (Alabama argillacea (Hbn)). Bacillus thuringiensis showed some promise in the control of this insect. Insecticides with trade marked designations mentioned above are: Bayer 25141 (O,O-diethyl O-(p-methylsulfinyl) phenyl phosphorothioate), Geigy G-30494 (S-(2,5-dichlorophenylthio) methyl O,O-dimethyl phosphorodithioate), Guthion® (O,O-dimethyl S-(4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethyl)phosphorodithioate), Sevin® (1-naphthyl methylcarbamate), Shell SD-4402 (1,3,4,5,6,7,8,8-Octachloro-3a,4,7,7a-tetrahydro-4, 7-methanophthalan), Shell SD-3562 (dimethyl 1-(dimethylcarbamoyl)-1-propen-2-yl phosphate), Shell SD-5539 (m-Nitrobenzyl 3-(dimethoxyphosphinyloxy) crotonate), Strobane® (a mixture of chlorinated terpenes with about 66% of chlorine), and Trithion® (S-(p-chlorophenylthio)methyl O,O-diethyl phosphorodithioate).

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