1. Dep. of Horticultural Science Univ. of Minnesota 1970 Folwell Ave. St. Paul MN 55108 USA
2. BauerTurf 700 Twelve Oaks Center Dr. Wayzata MN 55391 USA
3. Dep. of Plant, Soil and Microbial Sciences Michigan State Univ. 1066 Bogue St. East Lansing MI 48823 USA