In general, overwintering bean leaf beetle adults are susceptible to cold temperatures and are more likely to survive a warm winter. Predicted mortality around the state is low compared to most years, ranging from 30-53%. But lack of insulating snow cover may actually increase mortality. With those factors in mind, I am estimating overwintering beetles may be out in greater numbers compared to the last few years. Early-planted fields should be scouted for adults, especially food-grade soybean.
Predicted overwintering mortality of bean leaf beetle based on accumulated subfreezing temperatures during the 2011-2012 winter.