Title: Contact toxicity of twenty insecticides applied to Symmerista canicosta
Author: Robertson, Jacqueline L.; Lyon, Robert L.; Shon, Fay L.; Gillette, Nancy L.
Source: Pacific Southwest Forest and Range Experiment Station, Forest Service, USDA, Berkeley, California 94701
Description: Twenty insecticides were tested by topical application on mixed groups of 4th- and 5th -stage larvae of Symmerista canicosta Franclemont. Four exceeded DDT in toxicity at LD50 but only resmethrin was significantly mor toxic. Most of the compounds showed unusually high toxicities. Twelve, listed in decreasing order of toxicity, caused 50% mortality with <5μg/g body weight: resmethrin, methonmyl, phoxim, pyrethrins, DDT, Zectran (4-dimethylamino-3.5-xylyl methylcarbamate), chlorpyrifos, Landrin (3,4,5- (93%) and 2,3,5-trimethylphenyl methylcarbamate (7%)), Gardona (2-chloro-1-(2,4,5-trichlorophenyl) vinyl dimethyl phosphate), carbaryl, Imidan (0,0-dimethyl phosphorodithioate S-ester with N-(mercaptomethyl) phthlimide), and aminocarb. Several were promising candidates for field testing.
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Robertson, Jacqueline L., Lyon, Robert L., Shon, Fay L., Gillette, Nancy L. 1972. Contact toxicity of twenty insecticides applied to Symmerista canicosta. Pacific Southwest Forest and Range Experiment Station, Forest Service, USDA, Berkeley, California 94701
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