Evaluation on Role of Predators in Helicoverpa armigera Control

Abstract

This paper analyzed the dynamics of the number and spatial niches of cotton bollworm predators in the fields, and then constructed predators evaluated model considering the number, temporal and spatial niches of natural enemy at the same time The results based on the model showed: during the occurrence periods of cotton bollworm, roles of predator guilds against Helicoverpa armigera egg and earlier instar were ladybirds and lacewings, predaceous bugs, spiders And the role of predator guilds or dominant predators were different in different cotton bollworm generations The dominant natural enemies were Propylosa japonica and predaceous bugs in the second generation,P. japonica and Campylomma diversicornis in the third generation, C. diversicorni, spiders and P. japonica in the fourth generation