Received for publication March 10, 1978. Approved by the Director of the New York State Agricultural Experiment Station, Geneva NY for publication as Journal Paper No. 3140.
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 maked advertisement solely to indicate this fact.
Assistant Professor, Dept. of Pomology and Viticulture, N.Y.S. Agricultural Experiment Station, Geneva, NY. The author gratefully acknowledges the excellent technical assistance of S. G. Carpenter and J. E. Barnes and the valuable discussions with F. S. Davies.