The ovicidal and larvicidal activity of Tracer Naturalyte Insect Control and conventional ovicidal standards was investigated on Helicoverpa spp. under Australian conditions. Two trials were carried out; the first used laboratory reared Helicoverpa armigera eggs, and the second used Helicoverpa spp. eggs naturally laid on field cotton. The results showed that Tracer killed 10-30% of eggs and 20-80% of hatching neonates. The ovicidal activity of Tracer was slightly less than conventional ovicidal standards (Larvin, Ovasyn and Lannate'), however, the combined ovicidal and larvicidal action was generally equivalent to , or greater than the standards. These data show that Tracer should be applied at the brown egg stage to utilise both the ovicidal and Larvicidal action of this product.