1. Former research associate and professor, respectively, Food Science Department, University of Arkansas, Fayetteville, AR.
2. Corresponding author. E-mail: tsiebenm@comp.uark.edu Phone: 501/575-2841. Fax: 501/575-6936.
3. Professor, Rice Research and Extension Ctr, University of Arkansas, Stuttgart, AR.
4. Extension plant pathologist, Cooperative Extension Service, USDA, University of Arkansas, Little Rock, AR.