title: Effects of transgenic Bt cotton on the population density, oviposition behavior, development, and reproduction of a nontarget pest, Adelphocoris suturalis (Hemiptera: Miridae).
abstract: Transgenic cotton has shown great promise for the control of target pest insects; however, frequent outbreaks of nontarget pest mirids has been recorded in recent years in northern China. To test the hypothesis that transgenic cotton contributes to nontarget pest outbreaks, we studied  the impact of transgenic Bt cottons (both Bt and Bt + CpTI) on the fitness of nontarget pest Adelphocoris suturalis Jakovlev. No significant differences were detected between population densities of A. suturalis in unsprayed nontransgenic cottons and in unsprayed  transgenic Bt cottons in 2007, 2008, and 2009. No difference in preferred oviposition site or egg production was detected between transgenic and nontransgenic cottons in both free choice and no choice tests. No difference in life table parameters was detected for A. suturalis between  Bt cottons and nontransgenic cottons. All these results indicated that transgenic crops did not contribute to the nontarget pest outbreaks when being compared with their parental lines. The possible reasons for intensified pest status of A. suturalis, such as decrease of pesticide application,  deficient natural enemies, and area-wide shift of cotton varieties, were discussed.
authors: Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China.
authors: Guoping
authors: G
authors: Li
authors: Hongqiang
authors: H
authors: Feng
authors: Peiyu
authors: P
authors: Chen
authors: Shaoying
authors: S
authors: Wu
authors: Bing
authors: B
authors: Liu
authors: Feng
authors: F
authors: Qiu
mesh_terms: D000818:Animals; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics / Q000494:pharmacology*; D004731:Endotoxins / Q000235:genetics / Q000494:pharmacology*; D005260:Female; D003368:Gossypium / Q000235:genetics / Q000469:parasitology*; D006430:Hemiptera / Q000187:drug effects* / Q000254:growth & development; D006460:Hemolysin Proteins / Q000235:genetics / Q000494:pharmacology*; D008297:Male; D010058:Oviposition / Q000187:drug effects*; D030821:Plants, Genetically Modified / Q000469:parasitology*; D011156:Population Density
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis