Insecticide Tests Against Thrips on Cotton

Abstract

In replicated small-plot field tests good control of thrips (primarily Frankliniella fusca (Hinds)) was obtained with sprays of Bayer 25141 ( O,O -diethyl O-p -methylsulfinylphenyl phosphorothioate), toxaphene +DDT, Shell SD-3562 (dimethyl 1-(dimethylcarbamoyl)-1-propen-2-yl-phosphate), endrin + Shell SD-3562, methyl parathion +DDT, methyl parathion + Shell SD-4402 (1,3,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4, 7-methanophthalan), Bayer 29493 ( O,O -dimethyl O -[4-methylthio- m -tolyl] phosphorothioate), Geigy 30494 (S-(2-5-dichlorophenylmercapto) methyl O,O -dimethyl phosphorodithioate), Zectran® (4-dimethylamino-3,5-xylylmethylcarbamate), Guthion® ( O,O -dimethyl S -(4-oxo-1,2,3, benzotriazill-3-(4 H )-ylmethyl) phorodithioate) +DDT, Sevin® (1-naphthyl N -methylcarbamate), toxaphene, and Geigy 30493 ( S -(3,4-dichlorophenylthio)-methyl O,O -dimethyl phosphorodithioate). Better residual control was obtained with Bayer 25141, Shell SD-3562, and toxaphene +DDT than with the other materials in the test. The addition of Plyac (Polyethylene spreader-sticker) to sprays of toxaphene +DDT, Sevin, and Guthion +DDT did not improve the control or extend the residual activity of these materials against thrips. The application of toxaphene and Shell SD-3562 in the reemergence herbicide treatment failed to give any control of drips after the cotton came up. One application of Shell SD-3562 did not give as good season-long control as three applications at weekly intervals.