Received for publication May 13, 1978. This research was partially supported by a grant from the Michigan Turfgrass Foundation. We are grateful to Dr. Albert E. Dudeck, Department of Ornamental Horticulture, University of Florida, Gainesville, Florida for supplying the warm season plant material.
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Graduate Research Assistant (now Assistant Professor, Dept. of Agronomy, Miss. State Univ., Miss. State, MS 39762), Professor (now Professor, Dept. of Soil & Crop Sci., Texas A & M Univ., College Station, TX 77843) and Extension Associate (now Director of Research and Development, Chemlawn Corp., Columbus OH 43210).