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Laboratory evaluation of several chemical protectants against the southern cowpea weevil, Callosobruchus chinensis, on stored dried beans in Korea



Laboratory evaluation of several chemical protectants against the southern cowpea weevil, Callosobruchus chinensis, on stored dried beans in Korea



Jour Econ Entomol 56(5): 588-591



Laboratory experiments were conducted to compare the effectiveness of emulsifiable and dust formulations of Bayer 29493 (O,O-dimethyl 0-[4-(methylthio)-m-tolyl] phosphoro-thioate), Pyrenone Grain Protectant (0.08% pyrethrins, 1.20% piperonyl butoxide), Dipterex (O,O-dimethyl 2,2,2-trichloro-1-hydroxyethyl phosphonate) and agricultural grade malathion as protectants for small red beans (Phaseolus angularis) from damage by Callosobruchus chinensis (L.). Where direct comparisons permitted, the emulsifiables proved generally more effective than the dusts. Bayer 29493 emulsifiable as low as 4 ppm gave longer and better protection than other materials. Malathion EC at 4 ppm and Bayer 29493 dust at 16 ppm were second in general efficacy. Pyrenone Grain Protectant dusts containing 1.6 and 2.4 ppm pyrethrins and 24 and 36 ppm piperonyl butoxide in one trial compared favorably with Bayer 29493 EC at 4 ppm and malathion EC at 2 and 4 ppm 30 days after application. While Bayer 29493 EC, malathion EC and Pyrenone Grain Protectant dust show promise against C. chinensis more trials over longer periods must be undertaken to evaluate their usefulness fully. Viability in the beans from the less effective treatments was low, probably owing to extensive weevil damage rather than to phytotoxicity resulting from the insecticide. Washing the beans immediately after treating with Bayer 29492 EC and malathion EC and Pyrenone Grain Protectant dust and again at 30 days greatly reduced the efficacy of the treatments.

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Accession: 014093435

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DOI: 10.1093/jee/56.5.588


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