Contact toxicity of twenty insecticides applied to Symmerista canicosta

Abstract

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.

Citation

Robertson, Jacqueline L., Lyon, Robert L., Shon, Fay L., Gillette, Nancy L. 1972. Contact toxicity of twenty insecticides applied to Symmerista canicosta. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 3p.