Bacillus thuringiensis based insecticides have been available for use for several years, however, they have not been a force in the cotton market. This is in part due to the excellent combination of efficacy and economy provided by the pyrethroids. Pyrethroid resistance has been increasing in Heliothis virescens in recent years. This has led to an increased interest in using Bt insecticides in cotton for bollworm and budworm control. Javelin WG^® is the SA-11 strain of B.t. kurstaki. Bioassay results confirm that Javelin has higher levels of activity against Helicoverpa zea and Spodoptera exigua than other commercial Bt strains. In 1990 trials were conducted to evaluate the effectiveness of Javelin in controlling cotton bollworm and tobacco budworm in cotton. Treatments of Javelin and an ovicide were compared to commercial pyrethroids under grower conditions in large plot trials. At all locations a rate response was noted with 0.5 lb of Javelin being superior to 0.25 lb/A. Damage ratings and yields at the College station location indicated no statistical difference between the higher Javelin rate and the grower treatment. At the Uvalde location Javelin was equal or superior to the pyrethroid in square or boll damage. Results indicate that Javelin WG^® and an ovicide can effectively control bollworm and budworm and is a viable alternative to pyrethroids.