Approximately 65% of Mississippi's 1.16 million acres of cotton were planted to Bt-transgenic varieties in 1999. A field survey was conducted during late season to compare performance of Bt and non-Bt varieties. Bt fields sustained significantly less caterpillar induced boll damage, 1.48% vs 3.44%, and received significantly fewer foliar insecticide treatments for control of bollworm and tobacco budworm, 0.44 vs 2.47.