1. Dep. of Plant and Soil Sciences Univ. of Kentucky Lexington KY 40546 USA
2. Dep. of Plant Pathology Univ. of Kentucky Research and Education Center Princeton KY 42445 USA
3. Dep. of Agricultural Economics Univ. of Kentucky Lexington KY 40503 USA
4. Dep. of Plant and Soil Sciences Univ. of Kentucky Research and Education Center Princeton KY 42445 USA