1. Department of Agronomy, University of Wisconsin-Madison, and Cereal Crops Research Unit, Agricultural Research Service, USDA, 501 Walnut St., Madison, WI 53705, and Phone 608/262-4482. Fax 608/264-5528. E-mail: dmpeter4@facstaff.wisc.edu Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also be suitable.