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Persistence And Inheritance Of Costs Of Resistance To Imidacloprid In Colorado Potato Beetle, Mitchell Baker, Andrei Alyokhin, Adam Porter, David Ferro, Shana Dastur, Nehal Galal

Andrei Alyokhin

Reduced fitness among resistant versus susceptible individuals slows resistance evolution and makes it easier to manage. A loss of resistance costs could indicate novel adaptations or mutations contributing to resistance. We measured costs of resistance to imidacloprid in a Massachusetts resistant population compared with a Massachusetts susceptible population in 1999 in terms of fecundity, hatching success, egg development time, and sprint speed. Resistance was additive and seemed to be polygenic with high heritability. The fecundity cost appeared overdominant in 1999, and the hatch rate cost was partly recessive in 1999, but neither was signiÞcantly different from dominant or recessive. In …