ovo-larvicidal activity of insecticides, Bacillus thuringiensis (Bt) and insecticide-Bt mixtures was evaluated against three ages of tobacco budworm eggs on cotton in the field. Percentage of hatched eggs was significantly lower for Larvin, Bolstar, Ovasyn and Cymbush than Javelin or untreated control for 1 and 2 day old eggs. In 0 day old eggs, percentage of eggs hatched in Ovasyn and Bolstar treatments was similar to Bt. Ovicidal activity generally decreased from 2 day old eggs to 0 day old eggs. Larval survival for all treatments was significantly lower than untreated control for 1 and 2 day old eggs. In 0 day old eggs, mortality in Ovasyn treatment was similar to untreated control. Larvicidal activity increased with addition of Javelin but the increase was significant only for Larvin (0. 125 lb/a) and Ovasyn (0. 125 lb/a) in 0 day old eggs. Larval survival decreased significantly from 2 day to 0 day old eggs.