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Bt maize genotypes do not harm Trichogramma pretiosum when exposed to vegetative and reproductive structures

ABSTRACT We evaluated the effects of Bt maize genotypes expressing different Bt proteins on Trichogramma pretiosum. The laboratory bioassays consisted of exposing T. pretiosum to leaf, stem, and pollen of Bt maize genotypes and isogenic lines. The reduction on parasitism was used to classify the treatments according to the IOBC scale. In all bioassays, the reduction on parasitism was lower than 30%, and the Bt maize were harmless to T. pretiosum. The laboratorial method used proved to be reliable to verify harmlessness of Bt maize genotypes expressing different proteins on T. pretiosum.