With YieldGard® Corn Borer / Roundup Ready® Corn 2 you have the protection from European corn borer and the convenience of the Roundup Ready® Corn 2 System all in one. Renze Seeds YieldGard® Corn Borer stacked with Roundup Ready® corn hybrids produce an insecticidal protein derived from the bacterium Bacillus Thuringiensis. These hybrids provide protection against the European corn borer far greater than, optimally timed costly insecticides. Also the suppression of southwestern corn borer gives you an additional direct benefit. Include YieldGard® Corn Borer with the genetically improved Roundup Ready® System and you will also have an efficient means of controlling tough weed species without the concern of carryover. 20% refuge is required.