The evolution of resistance to the Bacillus thuringiensis ( Bt ) toxins by insect pests is a major threat to Bt technology. However, the rate of resistance can be slowed with appropriate integrated insect resistance management (IRM) strategies. Surveys were conducted to identify alternate host species for Maruca vitrata (commonly called the legume pod borer or Maruca ) that could serve as refuges for Pod-Borer Resistant (PBR)...