1. Dep. of Horticulture and Landscape Architecture Purdue Univ. West Lafayette IN 47907 USA
2. Wabash County Extension Purdue University Wabash IN 46992 USA
3. Dep. of Horticulture and Natural Resources Kansas State Univ. Manhattan KS 66506 USA
4. Bayer Environmental Science 2483 County Rd A Denton NE 68339 USA