1. Department of Horticulture; University of Arkansas; Fayetteville AR 72701 USA
2. Crop Improvement and Protection Research Unit; USDA-ARS; Salinas CA 93905 USA
3. Vegetable Research Center; University of Arkansas; Alma AR 72921 USA
4. Department of Plant Pathology; University of Arkansas; Fayetteville AR 72701 USA