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Contributor Notes
Present address: Ministry of Agriculture and Food, Horticultural Research Institute of Ontario, Vine-land Station, Ontario LOR 2E0, Canada.
Received for publication 25 Apr. 1988. This work was supported in part by contract ISD 83-00178 to C. Chong from Agriculture Canada. We thank Benoit Landry and Diane Choquette for their suggestions during the preparation of the manuscript. The technical assistance of Robert Monast is also acknowledged. 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.
