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Pesticide Toxicology Laboratory

ISU Entomology / Pesticide Toxicology Laboratory / Effect of Bt-toxin (Cry1Ac) in transgenic cotton on the adult longevity of four Heteropteran predators

Effect of Bt-toxin (Cry1Ac) in transgenic cotton on the adult longevity of four Heteropteran predators

Authors: 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.

Comments

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.