The one thing certain with CRW is that nothing is certain. While western CRW resistance to the Cry3Bb1 trait has been established in multiple areas within the Corn Belt, it continues to be spotty. Even in those areas, other traits appear to provide control, though the low dose rate (offers less than 99.9% control) of CRW traits, including pyramid traits, suggests resistance will eventually develop. Careful use of these tools in conjunction with integrated pest management techniques and best management practices can extend their useful life.

  • Scout for root feeding in growing corn and for adult CRW beetles in mid- to late summer. Develop control strategies accordingly for the following year.
  • Where and when possible utilize crop rotation.
  • If corn-on-corn, in areas with extended diapause northern CRW or in areas with rotation resistant western CRW, rotate CRW trait hybrids to avoid repetitive use of traits in the same field.
  • In areas with established or suspected resistance to Cry3Bb1 only protected hybrids, if planting hybrids with only that trait,  a soil-applied planting-time insecticide should be used, consider switching to alternative trait hybrids, or use pyramided hybrids with multiple CRW trait protection.
  • If adult beetle counts suggest heavy pressure to corn the following year and you can't rotate to a different crop, consider using multiple modes of action to minimize lodging and yield impacts, combining a soil-applied insecticide with CRW trait-protected hybrids.