Received for publication 3 July 1985. Research supported by the Graduate Research Committee of the University of Wisconsin-Madison and by Hatch Act funds. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. 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.
Graduate Research Assistant.
Assistant Professor of Horticulture.
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