The study showed that the insect-resistance of transgenic hybrid poplar 741 was closely related with temperature. The total mortality and accumulative mortality of Gypsy moth (Lmantriadispar L.) larvae increased with increasing temperature, and the sensitivity of larvae to the clones of transgenic hybrid poplar 741 and temperature decreased gradually with the increasing instars. Temperature had a promotion to the development of larvae fed on CK. When the temperature was high, the development of larvae quickened, the development period shortened, and the weight increasing rate and the frass increasing quantity quickened, but the development rate of larvae fed on transgenic hybrid poplar 741 was not obvious with varied temperature. The regressive equation of temperature and Clostera anachoreta (Fabricius) mortality during 1998-2000 year indicated that high resistant and medium resistant clones' temperature-insect mortality curve presented an obvious regressive relation.
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