1. Department of Forest and Conservation Sciences University of British Columbia Vancouver BC V6T 1Z4 Canada
2. UC Cooperative Extension Humboldt and Del Norte Counties Eureka CA 95503 USA
3. Kalamalka Research Station BC Ministry of Forests Lands and Natural Resource Operations 3401 Reservoir Road Vernon BC V1B 2C7 Canada
4. Department of Microbiology and Immunology University of British Columbia Vancouver BC V6T 1Z3 Canada