Miryeong Sohn,^a David S. Himmelsbach,^a Sandra E. Kays,^a Douglas D. Archibald^b and Franklin E. Barton, II^a
United States Department of Ariculture, Agricultural Research Service, R.B. Russell Agricultural Research Center, Athens, GA 30605, USA
^bDepartment of Crop and Soil Sciences, Penn State University, University Park, PA 16802, USA