1Received for publication May 7, 1980. Approved for publication as Journal Article No. 83-80 of the Ohio Agricultural Research and Development Center, Wooster, OH 44691.
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2Former Graduate Research Associate (Present address: Department of Horticulture, Georgia Experiment Station, Experiment, GA. 30212) and Associate Professor, respectively.
3Former Associate Professor, Ohio State University. Present mailing address: Department of Horticulture, University of Wisconsin, Madison, WI 53706.
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