George P. Wene

Salt-Marsh Caterpillar Control on Cotton in Arizona

In 1955 tests at Yuma, mixtures of toxaphene and DDT, formulated both as dusts and sprays, effectively controlled the salt-marsh caterpillar, Estigmene acrea (Drury); these mixtures were slightly more effective than parathion formulations and much more effective than formulations of malathion, Diazinon® ( O,O -diethyl O -(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate) and sodium fluosilicate. A spray formulation containing methyl parathion and toxaphene also gave satisfactory control. Results of 1958 tests near Phoenix indicated an apparent resistance to toxaphene-DDT mixtures although good control was obtained with formulations containing Diban (1 part 1,- 1-bis( p -chlorophenyl)-2-nitropropane and 2 parts 1,1-bis( p chlorophenyl)-2- nitrobutane), Dylox® ( O,O -dimethyl 2,2,2- trichloro-1-hydroxyethylphosphonate), parathion, Sevin® (1- naphthyl- N -methyl carbamate), and a mixture of endrin plus methyl parathion.