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Abstract
Field trials were conducted during 1961-63 in mountainous northern California for control of the alfalfa weevil, Hypera postica (Gyllenhal), by pre-ovipositional applications of granulated and liquid insecticides. Excellent control was afforded by heptachlor granules at 0.25 Ib active material per acre and by granulated Telodrin® (1,3,4,5,6,7,8,8-octachloro -1,3,3a,4,7,7a hexahydro -4,7-methanoisobenzofuran) at 0.125 lb. With these low dosages, the optimum time for treatment was prior to any sign of new growth of alfalfa in the spring. Neither General Chemical4072 (2-chloro-l- (2,4-dichlorophenyl) vinyl diethyl phosphate), lmidan® (O,O-dimethyl S-phthalimidomethyl phosphorodithioate), nor Bidrin® (3-hydroxy- N,N-dimethyl.cts-croton-amide dimethyl phosphate) provided appreciable control when applied in the early spring. A population of the alfalfa weevil highly resistant to heptachlor was found in Lassen County and there were indications that this population was resistant also to certain other chlorinated hydrocarbon insecticides.
Published Version
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