Douglas-Fir Tussock Moth:1 Contact Toxicity of 20 Insecticides Applied to the Larvae13

1 December 1973

journal article
Published by Oxford University Press (OUP) in Journal of Economic Entomology

Vol. 66 (6) , 1255-1257
https://doi.org/10.1093/jee/66.6.1255

Abstract

Twenty chemicals were tested for their toxicity to 4th-instars of Hemerocampa pseudotsugata McDunnough. Eleven were more toxic than the standard, mexacarbate, at both LD₅₀ and LD₉₀. They were, in decreasing order of toxicity at LD₅₀ bioethanomethrin, NIA 26021 ([+] cis stereo isomer of resmethrin), NIA 18739 ([+] trans stereo isomer of resmethrin), resmethrin, methomyl, phoxim, DDT_pp′, chlormethylfos, and Phosvel ®([2, 5-dichloro-4-bromophenyl) O-methyl phenyl thiophosphate). The descending order of toxicity at LD₉₀ was: bioethanomethrin, NIA 26021, NIA 18739, resmethrin, methomyl, phoxim, chlorphoxim, pyrethrins, DDT_pp′, chlormethylfos, and Phosvel. The cis isomer of resmethrin was significantly more toxic at both LD₅₀ and LD₉₀ than the trans isomer. Data also were obtained on the effect of posttreatment holding conditions and on the effect of dye tracers and stabilizing adjuvants on the insecticidal activity of pyrethrins.

Keywords

This publication has 0 references indexed in Scilit: