title: Regional reversion of insecticide resistance in Helicoverpa armigera (Lepidoptera: Noctuidae) is associated with the use of Bt cotton in northern China.
abstract: A continuous programme for monitoring resistance of Helicoverpa armigera (Hubner) to commonly used insecticides was undertaken for assessing the impact of Bt cotton planting on the evolution of the pest resistance from 1994 to 2002 in China. The bioassay results showed that the resistance levels per year in field populations of H armigera to lambda-cyhalothrin, phoxim and endosulfan decreased, respectively, to 9-15-fold, 11-14-fold and 6-8-fold in 2001-2002 from 197-262-fold, 52-74-fold and 18-38-fold before the cultivation of Bt cotton in 1997. This significant increase in susceptibility to insecticides is expected to result in a reduction in insecticide application for H armigera control in Bt cotton. It is concluded that Bt cotton is playing an important role in the long-term management of H armigera by increasing the potential for natural and chemical control of the pest.
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: Wei
authors.initials: W
authors.lastname: Mu
authors.forename: Gemei
authors.initials: G
authors.lastname: Liang
authors.forename: Yuyuan
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000818:Animals; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics*; D001427:Bacterial Toxins / Q000235:genetics*; D005075:Biological Evolution; D002681:China; D004726:Endosulfan / Q000494:pharmacology; D004731:Endotoxins / Q000235:genetics*; D003368:Gossypium / Q000235:genetics*; D006460:Hemolysin Proteins; D007305:Insecticide Resistance / Q000235:genetics*; D007306:Insecticides / Q000494:pharmacology; D007928:Lethal Dose 50; D009036:Moths / Q000235:genetics*; D009570:Nitriles; D009946:Organothiophosphorus Compounds / Q000494:pharmacology; D030821:Plants, Genetically Modified; D011722:Pyrethrins / Q000494:pharmacology; D013997:Time Factors
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