Abstract
Rearing of two fields strain (Marana, Yuma) of pink bollworm, Pectinophora gossyptella (Saunders), from Arizona under conditions free of insecticidesresulted in reversion of resistance (in adults) in four and five generations, respectively, to levelsclose to that found in the susceptible laboratory strain. Permethrin resistance in these field strains is unstable and is apparently in its early phase of development. Results suggest that monitoring of pink bollworm resistance in field strains reared in the laboratory should be performed in the F1 generation. Subsequent selection studies were performed on both larval and adult stages to investigate the capacity of the pink bollworm to develop resistance in both life stages. Fourteen generations of selection of larvae and adults with azinphosmethyl produced 1.9- and 1.6- fold tolerance, respectively, in the adult stage. Sixteen generations of larval selection with permethrin produced 9.7-fold resistance in adults; 14 generations of adult selection produced 8.8-fold resistance in adults. Azinphosmethyl evidently possessesa low degree of selectivity for development of resistance in pink bollworm adults. Selection of larvae with both azinphosmethyl and permethrin seemed to cause higher levels of tolerance in larvae than in adults.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
