Transgenic maize and cotton expressing Bacillus thuringiensis (Bt) toxins were first commercialized in 1996. By 2009, Bt crops were planted on ca. 47.6 Mha in 22 countries worldwide, with the USA and Canada accounting for 54% of this area. Resistance (virulence) development in target insect pests is a major threat to the sustainable use of Bt crops. Four major target pests of Bt crops in the USA and Canada – European corn borer, Ostrinia nubilalis (Hübner), southwestern corn borer, Diatraea grandiosella Dyar (both Lepidoptera: Crambidae), tobacco budworm, Heliothis virescens Fabricius (Lepidoptera: Noctuidae), and pink bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae) – remain susceptible to Bt toxins after 15 years of intensive use of Bt maize and Bt cotton. The success in sustaining susceptibility...
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BioSicherheit berichtet ausführlich über die aktuelle Forschung unter:
http://www.biosicherheit.de/aktuell/1341.bt-pflanzen-resistente-schaedlinge.html (deutsch)
http://www.gmo-safety.eu/news/1341.bt-plants-resistant-pests.html (englisch)
Das Gratis-Abonnement des BioSicherheit-Newsletters ist sehr empfehlenswert:
http://www.biosicherheit.de/