1. Department of Applied Chemistry, College of ScienceChina Agricultural University Beijing China
2. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant ProtectionChinese Academy of Agricultural Sciences Beijing China
3. Department of Entomology, College of Plant ProtectionChina Agricultural University Beijing China
4. Department of Biological Chemistry and Crop ProtectionRothamsted Research, Harpenden Hertfordshire UK