1. 1Hammond Research Station, Louisiana State University Agricultural Center, 21549 Old Covington Highway, Hammond, LA 70403, USA
2. 2Department of Horticulture, North Willamette Research and Extension Center, Oregon State University, 15210 NE Miley Road, Aurora, OR 97002, USA
3. 3US Department of Agriculture, Agricultural Research Service, US National Arboretum, Floral and Nursery Plants Research Unit, Otis L. Floyd Nursery Research Center, 472 Cadillac Lane, McMinnville, TN 37110, USA
4. 4Department of Agricultural Economics and Agribusiness, Louisiana State University Agricultural Center, 211 Martin D. Woodin Hall, Baton Rouge, LA 70803, USA
5. 5Department of Horticulture, Oregon State University, 4017 Agricultural and Life Sciences Building, Corvallis, OR 97331, USA
6. 6Cooperative Extension Agribusiness, Clemson University, 900 Clemson Road, Clemson, SC 29634, USA
7. 7Department of Horticulture, North Carolina State University, 152 Kilgore Hall, Raleigh, NC 27606, USA
8. 8US Department of Agriculture, Agricultural Research Service, Application Technology Research Unit, Williams Hall 215A, Wooster, OH 44691, USA
9. 9Department of Plant & Environmental Sciences, Clemson University, E-143 P&AS, Clemson, SC 29634, USA