Abstract: Advance in the research on monitoring and management strategies of resistance of Helicoverpa spp. To the transgenetic Bt cotton was reviewed. Mechanism and pattern of Bacillus thuringiensis toxicity to pests were included and potential ecological risks of commercially planted Bt cotton, of which resistance of insect pests to Bt cotton may be the major one, were analyzed. Based on the information available it seems that modification of the site, where the Bt toxin and the specific receptor in the infected insect was bound, may be the most significant mechanism of the resistance occurrence in the Lepidoptera insect. The refuge tactic, considered as one of the effective strategies for resistance management, has been adopted in Australia and US. Since the transgenic cotton has been planted in China, it is necessary to develop effective strategies to manage the resistance before the cotton bollworm develops resistance in the field.

Key words: cotton bollworm (Helicoverpa armigera), transgenic Bt cotton, resistance, management strategy, refuge