1. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology; Chinese Academy of Sciences; Chengdu 610041 P.R. China
2. Beijing Entry-Exit Inspection and Quarantine Bureau; Beijing 100026 P.R. China
3. Syngenta Jealott's Hill International Research Centre; Bracknell Berkshire RG42 6EY UK