title: Bt transgenic crops do not have favorable effects on resistant insects.
abstract: Sayyed et al. (Ecology Letters (2003) 6: 167-169) hypothesized that insecticidal Bacillus thuringiensis (Bt) toxins produced by transgenic crops could have nutritionally favorable effects that increase the fitness of resistant insects eating such crops. This idea was based on increased pupal weight of resistant larvae of diamondback moth, Plutella xylostella (L.), fed leaf discs treated externally with a Bt toxin. We summarize evidence from diamondback moth and other pests showing that the Bt toxins in transgenic crops do not enhance performance of resistant insects. Aside from a few notable exceptions in which performance of resistant insects did not differ between Bt and non-Bt crops, Bt crops had adverse affects on resistant insects.
authors.affiliation: Department of Entomology, University of Arizona, Tucson, AZ 85721, USA. brucet@ag.arizona.edu
authors.forename: Bruce E
authors.initials: BE
authors.lastname: Tabashnik
authors.forename: Yves
authors.initials: Y
authors.lastname: Carrière
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis / Q000235:genetics*; D018556:Crops, Agricultural / Q000235:genetics*; D007313:Insecta; D007305:Insecticide Resistance; D007306:Insecticides; D030821:Plants, Genetically Modified / Q000235:genetics*
chemical_list: D007306:Insecticides