Western Corn Rootworm Bt Traits and Resistance
Western corn rootworm resistance to Bt corn continues to be an issue in continuous corn in the United States. Fueled in part by repeated use of the same Bt traits and low refuge compliance during the early phases of adoption, field evolved resistance was first detected in 2009. To date, resistance to every commercially available Bt trait package has been detected in major corn production areas of the country. However, resistance is not uniform across all corn growing regions so be sure to check local conditions when making planting decisions.