1. Lake County Cooperative Extension, University of California, Lakeport 95453-5405
2. Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331-2902
3. Lake County Cooperative Extension, University of California, Lakeport
4. Sacramento County Cooperative Extension, University of California, Sacramento 95827-3823
5. Department of Plant and Microbial Biology, University of California, Berkeley 94720-3102
6. Pear Doctor, Inc., Kelseyville, CA 95451
7. Department of Botany and Plant Pathology, Oregon State University