Studies On Effects Of Transgenic Corn Expressing Cry1 Ab Toxin On Chrysopela Sinica (Neuroptera: Chrysopidae) And Trichogramma Ostriniae (Hymenoptera: Trichogrammatidae)

Transgenic crops resistant to insect have been planted commercially in many countries, which plays a great role in integrated pest management (IPM) and creats economic benefits. However, great concerns have been raised about the potential ecological risks of transgenic plants, and increasing attentions have also been paid for the effects of transgenic plants on non-target insects, especially on natural enemies. To assess the impact of transgenic corn expressing Bt Cry1Ab toxin on Trichogramma ostriniae and Chrysopela sinica, a series of experiments were conducted in laboratory.Experiments were carried out in laboratory to study the effects of different transgenic corn expressing Bt Cry1Ab toxin(MON810, Bt11 and Event176)pollen on Trichogramma ostriniae by feeding T. ostriniae females with suspension of pollen+10%honey or pollen + water. T. ostriniae females fed on corn pollen + honey lived significantly longer than those fed on corn pollen + water. There were no difference between females longevities those fed on regular corn pollen + water and Bt pollen + water, so pollen + honey and Bt pollen + honey were. The number of parasitized host eggs and the offsprings was the most when T. ostriniae females fed on honey alone . T. ostriniae females fed on suspension of regular corn pollen + honey and Bt corn pollen + honey parasitized significantly more eggs and produced offspring than those fed on regular corn pollen + water, Bt corn pollen + water and water alone. There were no significant differences among these feeding on corn pollen + water, Bt corn pollen + water, and water. No differences were found between these feeding on regular corn pollen + honey and Bt corn pollen + honey. But the number of progeny emerged of T. ostriniae fed on the suspension of MON810 pollen + honey and regular corn pollen + honey were significantly much more than those given honey alone. T. ostriniae females produced the most eggs on the first day after emerged and the number of parasitized eggs decreased gradually with the age of T. ostriniae females increased. The progeny sex ratio of T. ostriniae fed on transgenic Bt corn + 10%honey or transgenic Bt corn + water did not significantly differ from those fed on regular corn + 10%honey or regular corn + water except that of T. ostriniae fed on Bt11 corn pollen + honey were significantly lower than those fed on Bt11control pollen + honey food. And...