Insecticides for Control of the Cowpea Curculio, Chalcodermus aeneus, on Southernpeas1

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Abstract
Phosphate and carbamate insecticides were compared with the formerly recommended chlorinated hydrocarbon insecticides for control of the adult cowpea curculio, Chalcodermus aeneus Boheman. Several carbamate insecticides, Sevin® (I-naphthyl N-methylcarbamate), Zectran® (4-dimethylamino-3,5-xylyl methylcarbamate), Bayer 39007 (O -isopropoxyphenyl methylcarbamate), Bayer 37344 (4-(methylthio)-3,5-xylyl methylcarbamate), Hercules 5727 (carbamic acid, methyl-m-iso propylphenyl ester) at high rates controlled the adult cowpea curculio. Sevin was effective as a spray but was ineffective as a dust at equivalent rates. Phosphate insecticides that were effective include SD-3562 (2-dimethylcarbamoyl-l-methylvinyl dimethylphosphate), Bayer 25141 (O,O-diethyl O-p-methylsulfinylphenyl phosphorothioate), Bayer 41831 (O,O-dimethyl O-4-nitro-m-tolyl phosphorothioate), Guthion®(O,O-dimethyl S-(4-oxo-1,2,3-benzotriazin-3-(4H)-ylmethyl) phosphorodithioate), and Telodrin® (1,3,4,5,6,7,8,8-octachloro-l ,3,3a,4,7,7a-hexahydro-4,7-methanoisobenzofuran). Endosulfan and the phosphate insecticide Imdian (O,O-dimethyl S-phthalimidomethyl phosphorodithioate) varied in effectiveness. Heptachlor and all other chlorinated hydrocarbon materials except toxaphene were not effective, indicating that the weevil is tolerant to this group of insecticide. Results with toxaphenc at the recommended rate were variable.

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