Regional Management Strategy for Cotton Bollworm Helicoverpa armigera in China
Cotton bollworm Helicoverpa armigera (Hübner) is one of the most important insect pests in cotton, corn and vegetables in China. Transgenic cotton that expresses a gene derived from the bacterium Bacillus thuringiensis (Berliner) (Bt) has been deployed for combating cotton bollworm since 1997, and in 2005 its use had expanded to 3.3 million of the total 5.1 million hectares used for cotton production in China. The area-wide integrated pest management (AW-IPM) tactics associated with the planting of Btcotton have resulted in dramatic reductions in insecticide use and the occurrence of the pest in the country has been controlled effectively. Susceptibility of H. armigera field populations to the Bt-insecticidal protein Cry1Ac was monitored from 1997 to 2005. The results indicate that field populations are still susceptible to Cry1Ac protein and that a shift toward resistance among H. armigera populations is not apparent. The natural refuges derived from the mixed planting system of Bt-cotton, with non-Bt-corn, soybean and peanut, on single small-scale family holdings, possibly in combination with migration of the pest, play an important role in delaying the evolution of cotton bollworm resistance keywords Bt-cotton, China, Helicoverpa armigera, area-wide management, resistance management
KeywordsTransgenic Cotton Cotton Bollworm Cry1Ac Protein Economic Entomology Yellow River Region
Unable to display preview. Download preview PDF.