LI Yu-ping 1,2 JIANG Zai-min 2 FENG Jun-tao 1 XU Shan 2 ZHANG Xing 1(1.Research and Developmemt Center of Biorational Pesticide,Northwest Sci-Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100;2.College of Life Science,Northwest Sci-Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100)