Martin Barbre, head of the agency that manages the U.S. crop insurance program, last week toured Iowa fields hit by the Aug. 10 derecho to view storm damage and meet with farmers to discuss crop insurance concerns.

The agency wants to make sure that crop insurance companies are consistent in how they are treating farmers with crop damage from the storm, said Barbre, an Illinois farmer who is administrator of the U.S. Department of Agriculture’s Risk Management Agency and manager of the Federal Crop Insurance...