The assassin bug, Pristhesancus plagipennis (Walker) (Hemiptera: Reduviidae) is a, natural enemy of bug and larval insects in both orchard and field crops. Several, studies have suggested that P. plagipennis may be suited for inundative release, against pest insects such as Helicoverpa spp. and Creontiades spp. with inundative, releases resulting in reduced populations of these pests in cotton., However, a common challenge with the inundative release of beneficial insects such, as assassin bugs in cotton pest management programs is achieving a viable balance, between predator release rates and biological control efficacy. In this project we, examined the post-release establishment and biological control efficacy of assassin, bug released at rates of and below 1 nymph per metre crop row