Pink Bollworm in Cotton Boll (IMAGE) University of Arizona Caption The pink bollworm, a voracious caterpillar pest, quickly evolved resistance to two Bt proteins produced by biotech cotton in India, but continues to be suppressed in Arizona after more than 20 years. Credit Alex Yelich/University of Arizona. Usage Restrictions This visual may only be used in conjunction of reporting/posting of this news release. Credit must be stated as indicated. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.