Chapter 21 Integrated Pest Management ①Fruit Trees Wu Junxiang Li Yiping Junxw@nwsuaf.edu.cn lyD2003@126.comChapter 21 Integrated Pest Management Of Fruit Trees Wu Junxiang Junxiang Li Yiping Junxw@nwsuaf.edu.cn Junxw@nwsuaf.edu.cn lyp2003@126.com lyp2003@126.com