1. Department of Plants, Soils, and Climate, Utah State University, 4820 Old Main Hill, Logan, UT 84322, USA
2. Department of Plant Sciences, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA
3. University of California Cooperative Extension San Joaquin County, 2101 East Earhart Avenue, Suite 200, Stockton, CA 95206, USA
4. Horticulture Department, Oregon State University, North Willamette Research and Extension Center, 15210 NE Miley Road, Aurora, OR 97002, USA
5. Oregon State University, 4017 Agricultural and Life Sciences Building, Corvallis, OR 97331, USA
6. School of Environmental and Forest Sciences, University of Washington, Box 354115, Seattle, WA 98195-4115, USA
7. School of Plant Sciences, University of Arizona, 1140 East South Campus Drive, Tucson, AZ 85721, USA
8. University of California Cooperative Extension Orange County, South Coast Research and Extension Center, Irvine, CA 92618, USA