1. Southern Piedmont Agricultural Research and Extension Center Virginia Polytechnic Institute and State University 2375 Darvills Rd. Blackstone Virginia 23824 USA
2. Department of Plant and Soil Sciences University of Kentucky 1100 Nicholasville Rd. Lexington Kentucky 40546 USA
3. Agricultural and Natural Resources Extension Agent West Virginia University 525 Viand St. Point Pleasant West Virginia 25550 USA