Harry A. J. Hoitink, Professor, Department of Plant Pathology, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio; Carol A. Musselman and Terry L. Moore, Research Assistants, Department of Plant Pathology, Ohio Agricultural Research and Development Center, The Ohio State University; Leona E. Horst, Research Assistant; Charles R. Krause, Adjunct Associate Professor, U.S. Department of Agriculture, Agricultural Research Service, Application Technology Research Unit, Wooster, Ohio; Randy A. Zondag, Ohio State University Extension, Chair and Extension Agent, Lake County, Painesville, Ohio; and Hannah Mathers, Assistant Professor, The Ohio State University, Department of Horticulture and Crop Science, Columbus, Ohio.
This research was supported by a grant from the Ohio Water Development Authority, Columbus, Ohio, and by state and federal funds appropriated to The Ohio State University and the Ohio Agricultural Research and Development Center.
The authors thank G. Lee and D. Geary from Willoway Nurseries, Inc., Avon, Ohio; L.Humphreys and B. Rudy from Studebaker Nurseries, New Carlisle, Ohio; J.Maslin, Warner-Kingwood Nurseries, Willoughby Hills, Ohio; B. Schubert at Roemer Nursery, North Madison, Ohio; A.Harding and G. Dugan at Losely Nursery, Perry, Ohio; and G. Powell at Klyn Nurseries, Perry, Ohio, for their support in this work.
The authors also wish to thank D. Young of Fresh Aire Farms, Union City, Ohio, and C.Kipp Jr., Paygro Inc., South Charleston, Ohio, for supplying composted manures for this research.