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JOHN DUNN, PHD, is Professor Emeritus in the Department of Horticulture at the University of Missouri in Columbia, Missouri, where he taught and conducted research in turfgrass management and physiology. His research focus was on temperature stress physiology of turfgrasses. Within this general area, he directed his principal effort toward the study of cold hardiness of zoysiagrass and other warm season grasses. KENNETH DIESBURG, PHD, is a professor in the Department of Plant, Soil, and General Agriculture at Southern Illinois University in Carbondale, Illinois, where he coordinates the Turfgrass Management Breeding and Research program.
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