Graduate student. Present address: Assistant Professor, Dept. of Horticulture, Oregon State Univ., Corvallis, OR 97331.
Received for publication 16 Apr. 1987. A postgraduate scholarship from the Natural Sciences and Eng. Res. Council of Canada to B.C.S. is acknowledged gratefully. From the PhD dissertation of B.C.S. Technical assistance from S. van Schyndel, M. Blatter, and H. Speakman, and statistical consultation from J. O’Hara Hines are acknowledged gratefully. The selections came from a breeding program developed by W.D. Evans, Univ. of Guelph. 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.