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Effect of Bt-toxin (Cry1Ac) in transgenic cotton on the adult longevity of four Heteropteran predatorsAuthors: Ponsard, S., Gutierrez, A.P., Mills, N.J.
Journal, Volume, Year: Environmental Entomology, volume 31(6):1197-1205, 2002
Summary
A group of predators (Orius tristicolor, Geocoris punctipes, Nabis sp., and Zelus renardii) were fed a lepidopteran prey (Spodoptera exigua) that were reared on Bt cotton or a mix of two non-transgenic varieties. Orius and Geocoris feeding on Bt-fed prey had 28% and 27% significantly lower longevity, but only after the third trial was removed from analysis. There were not significant differences seen for the other species tested. |
Pesticide Toxicology Laboratory
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The Orius results disagree with those of Zwahlen et al, 2000 and Al-deeb et al, 2001. The difference is probably due to field collecting of the predators and the lack of a uniform background and age of the test subjects. The Orius species is not the same as in the other two studies.