Tobacco budworm, Heliothis virescens (F.) larvae were collected from pyrethroid field control failure in the Mississippi Delta in 1989. Testing with a residual plant bioassay indicated high levels of resistance to two synthetic pyrethroid insecticides and possible tolerance to a carbamate insecticide. The adult vial test method for monitoring resistance appeared to confirm the pyrethroid resistance found in the larvae collected. The data were compared to previous results with known resistant tobacco budworns. Pheromone traps were used to capture male moths for pyrethroid resistance monitoring. The adult vial technique was used to test these tobacco budworms for resistance to cypermethrin. A small plot replicated field trial was used to evaluate the effect of high rates of a pyrethroid insecticide for Heliothis spp. control. The data indicated that a large proportion of the populations were homozygous for resistance.