1. USDA Agricultural Research Service Plant Science Research Unit 439 Borlaug Hall, 1991 Upper Buford Circle St. Paul MN 55108 USA
2. Dep. of Agronomy and Plant Genetics Univ. of Minnesota 411 Borlaug Hall, 1991 Upper Buford Circle St. Paul MN 55108 USA
3. Dep. of Forest Resources Univ. of Minnesota 115 Green Hall, 1530 Cleveland Ave. North St. Paul MN 55108 USA
4. Univ. of Minnesota Extension 209D Green Hall, 1530 Cleveland Ave. North St. Paul MN 55108 USA