1. Vernon James Research and Extension Station, 207 Research Station Rd., Plymouth, NC 27692, USA;(D. R.)
2. Present address: Mid-Columbia Agricultural Research and Extension Center, 2990 Experiment Station Dr., Hood River, OR 97031, USA;(R. S.)
3. North Carolina State University, 840 Method Rd., Unit 1, Raleigh, NC 27695 USA;(H. B.)