1. College of Forestry, Northwest A&F University Yangling; Shaanxi China
2. Southern Crop Protection and Food Research Centre; Agriculture and Agri-Food Canada, London; Ontario; Canada
3. Natural Resources Canada, Canadian Forest Service, Great Lakes Forestry Centre; Sault Ste. Marie; Ontario Canada
4. Department of Biology; University of Ottawa; Ontario Canada
5. Chemistry Department; University of Western Ontario; Ontario Canada