professor Emeritus, Dept. of Horticulture and Forestry.
Professor, Dept. of Plant Pathology. Deceased.
Assistant Professor, Dept. of Horticulture and Forestry.
Area Horticultural Specialist, Dept. of Horticulture and Forestry.
Received for publication 11 July 1988. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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