Support from the U.S. Department of Agriculture, Agricultural Research Service in cooperation with the College of Agriculture and Home Economics, Washington

State University, Pullman, WA is appreciated. Trade names and company names are included for the benefit of the reader and do not imply endorsement or preferential treatment of the product by the U.S. Department of Agriculture or Washington State University. All programs and services of the U.S. Department of Agriculture are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, age, marital status, or handicap.

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