S. J. LeutyHorticultural Research Institute of Ontario, Vineland Station, Ontario, Canada L0R 2E0
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D. J. Pree
D. J. PreeAgricultural Canada, Research Station, Vineland Station, Ontario, Canada L0R 2E0
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Contributor Notes
Received for publication January 19, 1980.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.