Field Insecticide Tests Against Several Cotton Pests

Abstract

Good control of thrips ( Frankliniella spp.) was obtained with dimethoate, Di-Syston® ( O,O -diethyl S -[2-(ethylthio)ethyl] phosphorodithioate), and phorate granules applied in the furrow with the seed, and sprays of Shell SD-3562 (2-dimethylcarhamoyl-1-methylvinyl dimethyl phosphate), and mixtures of toxaphene, Strobane® (terpene chlorinates (65% chlorine)), and endrin with DDT. Good control of the tarnished plant bug ( Lygus lineolaris (Palisot de Beauvois)) was obtained with sprays of Bayer 25141 ( O,O -diethyl O-p -methylsulfinyl-phenyl phosphorothioate), Hercules 5727 ( m -isopropylphenyl methylcarbamate), Strobane DDT, Shell SD-4402 (1,2,3,4,5,6,7,8,8-octochloro-3a,4,7,7a-tetra- hydro-4,7-methanophthalan), Trithion® ( O,O -diethyl S-p -chloro-phenylthio-methyl phosphorodithioate), toxaphene-DDT, Methyl Trithion® ( O,O -dimethyl S-p -chlorophenylthiomethyl phosphorodithioate), Shell SD-5533 (dimethyl 1-( p -nitrobenzyloxycarbonyl)-1-propen-2-yl phosphate), Bayer 29493 ( O,O dimethyl O -]4-(methylthio)- m -tolyl] phosphorothioate), Sevin® (1-naphthyl N -methylcarbamate), Shell SD-3562,and Guthion® (italic> O,O -dimethyl S -(4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethyl) phosphorodithioate)-DDT. Geigy 30494 ( O,O -dimethyl S -2,5-dichlorophenylmercaptomethyl phosphorodithioate), Methyl Trithion, Trithion, Sevin wettable powder, and mixtures of DDT with endrin, toxaphene, methyl parathion, Strobane, or Guthion all gave good control of the boll weevil ( Anthonomus grandis Boheman) and the boll worm ( Heliothis zea (Boddie.)) Phorate granules lind sprays of ethion, Trithion, Diazinon® ( O,O -diethyl O -(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate), Geigy 30494, and Shell SD-3562, Delnav® (a mixture of 2,3- p -dioxanedithiol S,S -bis ( O,O -diethyl phosphorodithioate) (70%) and related compounds), and methyl parathion at 0.5 pound per acre gave good control of a spider mite ( Tetranychus lobosus Boudreaux).