Submitted to: National Entomological Society of America Annual Meeting
Publication Type: Proceedings
Publication Acceptance Date: 8/5/2003
Publication Date: 12/28/2003
Citation: Knight, A.L. 2003. How 40 years of guthion use changed codling moth. National Entomological Society of America Annual Meeting. Interpretive Summary:
Technical Abstract: Codling moth in decidiuous tree fruit and nut orchards in the western United States have been exposed to sprays and residues of azinphosmethyl (Guthion) for 40 years. The impacts of this widescale, though non-homogeneous selection process on various life history traits of this species have been profound. Studies were conducted with five field-collected populations to examine patterns of post-diapause emergence, larval developmental times, fecundity, tolerance to a range of insecticides, and pheromone biology. Due to correlative cross resistance it appears that simply replacing azinphosmethyl with other insecticides may not guarantee an end to its legacy with codling moth. Therefore it is important that we understand what we have created out in our orchard. It's not our father's pest.