1. Department of Horticulture, Oregon State University, Corvallis, OR 97333, USA
2. North Willamette Research and Extension Center, Oregon State University, Aurora, OR 97002, USA
3. Application Technology Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 1680 Madison Ave., Wooster, OH 44691, USA
4. Horticultural Crops Production and Genetic Improvement Research Unit, Agricultural Research Service, U.S. Department of Agriculture, 3420 NW Orchard Avenue, Corvallis, OR 97330, USA