Pesticide Toxicology Laboratory

Four secondary lepidopteran pests were evaluated for susceptibility to Bt corn. No effects were observed on larval survival, pupal weigh, or days to emergence for Agrotis ipsilon or Papaipema nebris. Lower pupal weigh and delayed development was observed for Pseudaletia unipuncta. In a field study, Bt and non-Bt corn was artificially infested with the four pests. No differences were found in plant damage for A. ipsilon, slight differences found for P. nebris, and significantly less damage caused by P. unipuncta and H. zea to Bt corn.