Evaluation of Bt Resistance in Helicoverpa zea Populations Using Various Bt Cotton Plant Tissues

Current resistance monitoring methods for Bt resistance in Helicoverpa zea populations consists of populations being assayed for resistance to a single purified Bt protein. Although current monitoring methods adequately indicate if a population has developed resistance to a particular Bt protein, they fail to evaluate how that may impact performance in the field. An assay utilizing Bt cotton plant tissue diet overlays may be utilized to evaluate field performance of a resistant Helicoverpa zea population.