Cellulase activities of Anoplophora glabripennis(Motseh.)adults from two host plants(Populus simonii x p pyramidliscr cv.Opera Hsu.and Salix matsudana Koidz)fed on three different host tree species(Acer negundo Linn.,S.matsudana Koidz and P siraonii × p pyramidliscr ev.Opera Hsu.)were investigated.Enzyme activities of endoglucanase and β-glucosidase in the intestines of the insects were measured.The results show that there are no statistically significant differences in the enzyme activities of endoglucanase between male and female insects from the two host plants fed on three host trees,neither in β-glucosidase.No statistically significant differences in the enzyme activities of endoglucanase and β-glucosidase were found between males and females from the two plants fed on three host tree species,except that the endoglucanase activity in males from the opera poplar fed on Hankow willow is lower than that fed on ash-leaf maple and opera poplar.