Greater than 400,000 and 350,000 acres of Bt cotton were planted in Alabama in 1996 and 1997, respectively. These Bt cotton plantings represent the largest percentage of cotton being planted with Bt cotton of any state. As a result, the concern over the development of Bt resistance occurring with the tobacco budworm (and to a lesser extent the cotton bollworm) has increased, especially in areas within Alabama which use Bt cotton primarily under the "96/4" strategy. A monitoring service for Bt resistance determination has been established by USDA/ARS, Stoneville, MS. In Alabama, a Bt Resistance Monitoring Kit was created and made available to all interested parties. Use of this kit facilitated delivery of "suspect worms" from Bt and non-Bt cotton to USDA/ARS for Bt resistance determination.