Refuge Requirements for the Corn Belt

In this area, refuges should be established as follows: On each farm, plant up to 80 percent of corn acres with Bt corn. Plant at least 20 percent of corn acres with non-Bt corn. The non-Bt corn can be treated with insecticides only when the level of pest pressure meets or exceeds economic thresholds. Sprayable Bt insecticides must not be applied to the non-Bt refuge corn. Plant the refuge (non-Bt corn) within, adjacent to, or near B.t. Corn Borer fields. The refuge must be placed within 1/2 mile of the B.t. Corn Borer field (1/4 mile or closer preferred).