1. Environmental and Resource Science/Studies Program, Trent Univ.; 1600 West Bank Drive Peterborough ON Canada K9J 7B8
2. Agriculture and Agri-Food Canada; Potato Research Centre; PO Box 20280 Fredericton NB Canada E3B 4Z7
3. Dep. of Environmental Sciences; Nova Scotia Agricultural College; PO Box 550, 21 Cox Rd. Truro NS Canada B2N 5E3
4. Agriculture and Agri-Food Canada; Greenhouse and Processing Crop Research Centre; Harrow ON Canada N0R 1G0
5. Agriculture and Agri-Food Canada; Brandon Research Centre; Grand Valley Road Brandon MB Canada R7A 5Y3