ABSTRACT

Bollgard II™ cotton was evaluated across the mid-South and East Texas to determine efficacy against heliothine caterpillar pests in 2002. Two types of studies were conducted across the region with crop consultants and academics. Studies consisted of "System" type trials and Unsprayed trials. Varieties included in each study consisted of a Bollgard II cotton line compared to a Bollgard® and non-B.t. cotton recurrent parent at each experiment site. Mean percent square and boll damage caused by heliothines was less in Bollgard II lines compared to Bollgard recurrent parents and considerably less than damage obtained in non-B.t. recurrent parents. Lint yield per acre was also greater in Bollgard II lines compared to Bollgard and non-B.t. recurrent parents. Bollgard lines exhibited greater yields than the non-B.t. recurrent parents.