Abstract:

Life tables of population of Lymantria dispar were established when the pest was separately fed with Transgenic hybrid poplar 741 [Populus alba×(P. davidiana+P. simonii)]×P. tomentosaand with the untransgenic control. The result showed that the indexes of population trend of the pest in a transgenic poplar forest were decreased by 82%～92% than that in the control stand, indicating that the transgenic 741 poplar was able to reduce the natural population of the target insect.The highest mortality occurred at the boring stage of young instars larvae,especially in early stage of 1st and 2nd instar larva. The food and environment integrated to affect the pest population, and diseases and the pupa natural death caused by the transgenic poplar were most obvious among the all death factors, parasitic rates of different instar larvae of Lymantria disparin the stand of transgenic hybrid poplar 741 decreased in comparison with the control, which was more obvious in the high insect-resistance hybrid poplar 741.

Key words: transgenic hybrid poplar 741, Lymantria dispar, life table of population