Received for publication January 12, 1974. Technical Paper No. 3733. OR Agricultural Experiment Station.
Horticulturist, Botanic Garden of the Chicago Horticultural Society, Glencoe, IL., and Professor of Horticulture, Oregon State University, Corvallis, respectively.
This research was supported by the Louis W. and Maud Hill Family Foundation, Saint Paul, MN.
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