ABSTRACT

Laboratory and field bioassays were performed with the pyrethroid insecticide cyfluthrin on boll weevil populations from the Yaqui Valley, Sonora, Mexico. Results indicated high correlation between both type of bioassays and showed a reduction in susceptibility to this insecticide. Pyrethroids should not be used against this pest and they have to be restrict for other insect pests to one month in middle of the cotton season as it was suggested in the resistance management strategy established for this region.