1.Institute of Fruit and Floriculture Research，Gansu Academy of Agricultural Sciences，Lanzhou，Gansu 730070； 2.Tianshui Institute of Pomology，Tianshui，Gansu 742500
Based on field investigation，specimens collection and communication with local people，Sinoxylon japonicum Lesne distribution，damage and its biological characteristics in Tianshui city were investigated.The results showed that Sinoxylon japonicum Lesne took place one generation every year in Tianshui city，and got across the winter in adult，the next year they came to be awaken from the early to middle of March and borer branches and tendrils to absorb replenishing nutrition，in the beginning of April they mating and spawning.Larvaes occurred in the last period of April and borer xylem in longitudinal along with the branches，the feces exhaust in tunnel，in the middle of June to the July mature larvae pupate in host pupa，about 6～7 days.In the last of June adult emergence without metastasis and stay in xylem for feeding.They transfered in the last of August，but they did not harm to new branches.