Abstract
The Bt toxin is selective in genetically improved crops, but its constant expression on the vegetables can affect the beneficial fauna. With the objective of assessing the effects of Bt corn on the duration of the larval cycle and weight of the Eriopis connexa adult, four treatments were established, with fifty repetitions, consisting on feeding larvae ad libitum with Sipha maydis and Spodoptera frugiperda, raised on both conventional and Bt corn until adulthood. In order to evaluate the incidence on fecundity and fertility, the adults of each group were separated in couples, with the same feeding. The studies were conducted under controlled conditions. Differences among treatments were determined using ANOVA and orthogonal contrasts, and these were significant among preys. With S. frugiperda on Bt corn the larval cycle was longer while the adult weight and fecundity were lesser. There were no differences with S. maydis on any of the kinds of corn.
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