Submitted to: Western Orchard Pest and Disease Management Conference
Publication Type: Abstract Only
Publication Acceptance Date: December 15, 2006
Publication Date: January 10, 2007
Citation: Knight, A.L. 2007. Good News? Codling Moth Exhibits Negative Cross Resistance Between Guthion and Rimon. Western Orchard Pest and Disease Management Conference. Interpretive Summary: Codling moth has unfortunately developed resistance to many new classes of insecticides. Studies conducted by researchers at the Yakima Agricultural Laboratory conducted a baseline survey of codling moth populations’ responses to a new insecticide that targets the egg. Unexpectedly, these data suggest that populations that are the most tolerant of the organophosphate insecticides are the most susceptible to this new material. This may be a positive development in the development of resistance management strategies for codling moth.
Technical Abstract: The responses of adult codling moth from several field-collected populations and a laboratory-reared colony to residues of Rimon were evaluated in plastic cup adult bioassays. Both fecundity and successful egg hatch varied among populations. Populations of codling moth that exhibited the highest LC50’s in previous topical and residual adult bioassays with Guthion had the lowest fecundity and egg hatch in the Rimon tests. The highest fecundity and levels of egg hatch were seen in the laboratory colony and a field population at the USDA experimental Farm that was created in 2002 by releasing 1,000’s of laboratory moths. The potential significance of these results will be discussed.