Chapter 20 Integrated Pest Control of Vegetable Crops Wu Junxiang Li Yiping Junxw@nwsuaf.edu.cn lyD2003@126.comChapter 20 Integrated Pest Control of Vegetable Crops Wu Junxiang Junxiang Li Yiping Junxw @nwsuaf.edu .cn lyp2003@126.com lyp2003@126.com