1. Commodity Utilization Research Unit, Southern Regional Research Center, Agricultural Research Service, U. S. Department of Agriculture, 1100 Robert E. Lee Blvd., New Orleans, LA 70124. Mention of trademark or proprietary products does not constitute a guarantee or warranty by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable. E-mail: mkdowd@nola.srrc.usda.gov