Vial testing for insecticide resistance was begun in 1994 to monitor the development of insecticide resistance to the pyrethroids (cypermethrin) and Curacron (profenofos) and beginning in 1997 testing for Tracer (spinosad) by the tobacco budworm (Heliothis virescens), and the cotton bollworm (Heliothis zea). Pyrethroid resistance by the tobacco budworm has progressed to the point of basically no control from 1994-1998. Curacron resistance in 1994 was very low. By 1998, Curacron was reaching critical levels of resistance by the budworms. Tracer is showing good control and low resistance levels. Bollworms are beginning to show some signs of resistance to pyrethroids.