BT STACKS INCREASE REGULATIONS FOR REFUGES

THE NEW corn hybrids with stacked Bt traits require close attention to the insect-resistance management (IRM) requirements. The YieldGard Plus hybrid contains both the YieldGard corn borer gene and the YieldGard rootworm gene. The refuge requirements are different for the two traits. Growers may meet the IRM rules in a common refuge or in separate refuges. In the common refuge, a 20% non-Bt corn refuge must be located within or adjacent to fields containing the YieldGard Plus traits. For the separate refuges, the corn rootworm refuge must be planted to 20% non-corn rootworm hybrid within or adjacent to the YieldGard Plus corn. The corn borer refuge must be planted to a minimum 20% non-corn borer Bt corn and may be planted up to one-half mile from the YieldGard Plus corn.