Abstract:In this paper , we discussed the effect of tree age on the feeding behavior of Clostera anachoreta from the per- spective of the influence of different-age poplar leaves as diet on the growth and development of C. anachoret. Results showed that the larva development period of C. anachoret fed on one-year-old poplar leaves was longer than that fed on 10-year-old and30-year-old leaves; In addition, the rate of pupa, the quality of pupa, and the amount of eggs of C. ana- choret fed on one-year-old poplar leaves are all higher than that of C. anachoret raised by 10-year-old and 30-year-old poplar leaves .