Charles W. Coggins Jr.Department of Botany and Plant Sciences, University of California, Riverside, CA 92521
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Current address: Agricultural Research Organization, The Volcani Center, Dept of Horticulture, Bet-Dagan 50-250, Israel.
Received for publication 22 July 1988. Mention of trade names or proprietary products in this publication does not imply endorsement by the Univ. of California nor criticism of similar ones not mentioned. This study was funded in part by the California Citrus Research Board. 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.