Insect Resistance to Crop Rotation
Two species of Diabrotica have evolved resistance to crop rotation that involves planting the same primary crop every second year in the same location. Diabrotica barberi has adapted by extending egg diapause for more than one winter. Diabrotica virgifera virgifera has lost its fidelity for corn, Zea mays, during the oviposition period; eggs are laid in most fields of vegetation in the crop landscape. Both adaptations permit eggs to hatch in cornfields. D. v. virgifera has also evolved resistance to most other IPM tactics over the past 60 years, including one type of insecticidal corn. This chapter explores the diverse approaches to IPM and the role of insect behavior in resistance management.