Studies on cutting off the food chain of pink bollworm, Pectinophora gossypiella (Saunders);

Bracon isomera (Cushman) and Bracon nigrorufum (Cushman),which parastize pink bollworm Pectinophra gossypiella Saunders in the cotton field,and two similar cardiociline wasps which parastize rice leaf roller Cnaphalocrocis medinalis Guenée in the paddy field of China.

Fifty two accessions of cotton were tested for resistance to pink bollworm in cages with cluster analysis, all the varieties were devided into four types and four independent varieties at r =0.

Resistance Monitoring of Pectinophora gossypiella to Four Organophosphorus Insecticides;

Forecasting population amounts of Pectinophora gossypiella use cottong developmental indexes as main factors;

The resistance to cotton pinkworm, Pectinophora gossypiella, of cotton varieties in Sichuan provincial regional trials was evaluated with the method of inoculating moth in cage in field in 2005.

By the methods of geostatistics,this paper analyzed the temporal structural characters and autocorrelations of the population dynamics of second generation cotton bollworm(Helicoverpa armigera)in Binzou City of Shandong Province in 1965—2004.

The Projection Pursuit Autoregression (PPAR) technology and grey system theory and method more compared by the analysing catastrophe prediction of the second generation of Helicoverpa armigera Hübner.