Keywords:
Chinese chestnut /Kermes nawai /Aprostocetus sp . /biological characteristics /utility
Abstract: Collection and observation on Aprostocetus sp .on Kermes nawai were executed in Jiande of Zhejiang 1998～ 2002 .The parasitoid occurred twice a year , the adults emerged in April to May , September to October respectively .The adults of the first generation lay eggs into the body of adults , the adults of the second generation lay eggs into the body of nymphs in second instar .The adults of Kermes nawai were collected and kept in laboratory , the adults of Aprostocetus sp .emerged were released in chestnut forest Quzhou , Zhejiang for control of Kermes nawai .The result showed that the population density of Kermes nawai decreased from 22.00 adults per 10 cm branch in April 2000 to 1.83 adults per 10 cm branch in April 2002 .The insect pests were kept under control. Chinese chestnut yield increased from 300 kg per hectare to 2 250 kg per hectare .[ Ch , 2 tab .7 ref .]