Received for publication February 20, 1974.
Agricultural Extension Service, Rehovot, and Department of Botany.
The authors wish to thank J. Gale of the Department of Botany, Mrs. R. Reisfeld and Mrs. Y. Eckstein of the Department of Chemistry, A. Ulmert, of the Agricultural Extension Service and M. Ahron of the Zacharia village, for their most helpful advice and assistance.
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