CROSS RESISTANCE OF DIPEL 2x RESISTANT STRAIN OF PINK BOLLWORM PECTINOPHORA GOSSYPIELLA (SAUND.) TO SOME CONVENTIONAL AND BIOINSECTICIDES
2006
El-Zemaity M.S. | A.E. Bayoumi | Mona F. Rofail | Hemat Z. Moustafa
A field strain of pink bollworm Pectinophora gossypiella (Saund.) collected from Sharquia Governorate, Egypt was exposed to the selection pressure of the for-mulation of Bacillus thuringiensis subsp. Kurstaki, Dipel 2x under laboratory condi-tions. Resistance ratio attained 16-fold based on the susceptible strain after 14 gen-erations of selection. Study the response of Dipel 2x resistant strain to some insecti-cides indicated that there is no cross resistance to the conventional insecticides, es-fenvalerate, chlorpyriphos and thiodicarb or the bioinsecticides Ecotech and Agerin. These data may be emphasizing the possibility of rotation the Dipel 2x with these insecticides in pest control program of pink bollworm to manage resistance to Bt products.
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