European corn borer resistance to Bt corn hybrids bears watching, according to Iowa State University pest management expert.

Iowa farmers are advised to scout their fields and consider management practices — such as stacking or pyramiding multiple Bt corn traits — for durable, broad-spectrum protection against European corn borer (ECB), as concerns grow over pest resistance following decades of effective control.

ECB, one of North America’s most destructive crop pests, has been ...