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-(4 H )-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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