Present address: Crop Production Division, Regional Development and International Affairs Branch, Agriculture Canada, Ottawa, Ontario, Canada K1A OC5
Received for publication Oct. 6, 1982. This research was supported in part by grant No. A6697 of the Natural Sciences and Engineering Research Council of Canada and by the Ontario Ministry of Agriculture and Food. We thank W. Pierce for technical assistance, J.A. Davies and colleagues for assistance at various stages of the work, and R.B. Stewart for reviewing the manuscript. C.L. Ricketson very kindly made his strawberry plantings available for the study. 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.
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