Russian wheat aphid (Homoptera: Aphididae) population variation in response to chlorpyrifos exposure Academic Article uri icon


  • Diuraphis noxia populations were assessed for variation in susceptibility to chlorpyrifos, changes in reproduction, and differences in esterase activity. Variation in susceptibility to chlorpyrifos was small but detectable among populations established in 1991 from four areas in Wyoming and Colorado. Resistance ratios ranged from 1.4 to 1.7 at the LC50 and 1.7 to 9.6 at the LC90. Offspring from survivors of chlorpyrifos exposure were typically less susceptible to chlorpyrifos than the parent generation. There was a greater range (among populations) of offspring produced through two days post-chlorpyrifos exposure as comapred with a narrower range of reproduction from the same populations not exposed to chlorpyrifos. In contrast, electrophoretic assay of esterases revealed three distinct bands but no variability of migration distance or staining intensity among aphid populations. -from Authors

published proceedings

  • Journal - Kansas Entomological Society

author list (cited authors)

  • Brewer, M. J., & Kaltenbach, J. E.

complete list of authors

  • Brewer, MJ||Kaltenbach, JE

publication date

  • January 1995