1Received for publication March 18, 1978. We thank Mr. Brian Otto for his valuable assistance.
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 marked advertisement solely to indicate this fact.
2Chief, Seed Research Laboratory, Agricultural Marketing Research Institute.
3Horticulturist, Vegetable Laboratory, Plant Genetics and Germplasm Institute.
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