1. USDA-ARS Southern Regional Research Center, P.O. Box 19687, New Orleans, LA 70179.
2. Corresponding author. E-mail: kbett@srrc.ars.usda.gov Phone: 504-286-4459. Fax: 504-286-4419.
3. USDA-ARS, Rice Research Unit, Beaumont, TX.
4. University of Arkansas Rice Research and Extension Center, Stuttgart, AR.
5. Louisiana State University Rice Research Station, Crowley, LA.
6. California Cooperative Rice Research Foundation, Biggs, CA.