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Monitoring of the Pink Bollworm1 Susceptibility to the Bacillus thuringiensis Endotoxins Cry1Ac and Cry2Ab in México

Abstract. The pink bollworm, Pectinophora gossypiella (Saunders), is a primary pest of cotton, Gossypium hirsutum L., in Mexico. Baseline and diagnostic concentration bioassays were used to determine the susceptibility of this pest to Becillus thuringiensis (Berliner) toxins Cry1Ac and Cry2Ab in different cotton-growing regions of Mexico, during 1998–2006. The LC50 values varied depending on the region and collection date or generation of insect. Pink bollworm populations from the Mexicali Valley, Baja California, were the most susceptible. In general, results obtained showed no indication of resistance by this insect in Mexico.