Received for publication October 27, 1971. This work was supported by a grant from the National Council of Research of Italy.
Institute of Horticulture, Viale delle Piagge n° 23, Pisa, Italy.
The authors thank F. Dennis, Horticultural Department, Michigan State University, East Lansing; and M. Kawase, Ohio Agricultural Research and Development Center, Wooster, for reading the manuscript.
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