1. former graduate research assistant, Mississippi State University, currently Department of Horticulture, University of Arkansas, Fayetteville 72701
2. Department of Entomology and Plant Pathology, Mississippi State University, Mississippi State 39762
3. Department of Plant Pathology, North Carolina State University, Raleigh 27695
4. Environmental Biology, University of Guelph, Ontario, N1G2W1 Canada