1. United States Department of Agriculture, Agricultural Research Service, Rice Research Unit, 1509 Aggie Drive, Beaumont, TX 77713. Mention of a trademark or propietary product does not constitute a guarantee or warranty of a product by the U.S. Department of Agriculture, and does not imply its approval to the exclusion of other products that also can be suitable.
2. Corresponding author. Phone: 409/752-5221 ext. 2242. Fax: 409/752-5720. E-mail: fgoffman@lycos.com.