Presently Assistant Professor, Dept. of Hort., Univ. of Maryland, College Park, MD 20742.
Received for publication 19 Feb. 1985. Scientific J. Ser. Paper No. 14,393. Minnesota Agr. Expt. Sta., St. Paul, MN 55108. 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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