title: Changes in susceptibility to conventional insecticides of a Cry1Ac-selected population of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae).
abstract: The changes in the susceptibility of the cotton bollworm, Helicoverpa armigera (Hübner) to three insecticides (lambda-cyhalothrin, phoxim and endosulfan) commonly used for control of this pest in China were monitored by bioassays at various generations. The insects were originally collected from Bt cotton fields and selected with Cry1Ac over 44 generations. In comparison with a susceptible strain, the larval resistance of the Bt-selected populations to Cry1Ac toxin increased 106-fold. Simultaneously, the resistance levels to lambda-cyhalothrin, phoxim and endosulfan declined dramatically. The results indicated no positive cross-resistance between Cry1Ac toxin and the insecticides. Evidence of the lack of cross-resistance to three commonly used synthetic insecticides in our laboratory-derived Cry1Ac-resistant population may suggest that growers can confidently use these insecticides if and when resistance to Cry1Ac cotton does occur.
authors.affiliation: Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100094, China. wkm@caascose.net.cn
authors.forename: Kongming
authors.initials: K
authors.lastname: Wu
authors.forename: Yuyuan
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000818:Animals; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D001427:Bacterial Toxins / Q000235:genetics / Q000378:metabolism*; D001681:Biological Assay; D004726:Endosulfan / Q000633:toxicity; D004731:Endotoxins / Q000235:genetics / Q000378:metabolism*; D006460:Hemolysin Proteins; D007305:Insecticide Resistance / Q000187:drug effects; D007306:Insecticides / Q000633:toxicity*; D007915:Lepidoptera / Q000187:drug effects*; D009570:Nitriles; D009946:Organothiophosphorus Compounds / Q000633:toxicity; D011722:Pyrethrins / Q000633:toxicity
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; D007306:Insecticides; D009570:Nitriles; D009946:Organothiophosphorus Compounds; D011722:Pyrethrins; C030956:insecticidal crystal protein, Bacillus Thuringiensis; C003135:phoxim; D004726:Endosulfan; C037304:cyhalothrin