Chapter 2 Principles and Methods of Integrated Pest Management Wu Junxiang T Li Yiping Junxw@nwsuaf.edu.cn yp2003@126.comChapter 2 Principles and Methods of Integrated Pest Management Chapter 2 Principles and Methods of Integrated Pest Management Wu Junxiang Junxiang & Li Yiping Junxw@nwsuaf.edu.cn lyp2003@126.com