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Citrus tristeza virus tolerant rootstocks grafted with Valencia oranges were compared in three different climatic areas. Yield results for 5 yr are presented. Other variables considered were: canopy volume, efficiency, percent juice, total soluble solids (TSS), acid, and TSSIacid ratio. From the preliminary results, the most promising rootstocks are Cleopatra mandarin, Carrizo and Toyer citranges, Volkamer lemon, Swingle citrumelo and C i t m amblycarpa. The selection of a single rootstock is not feasible due to the different climatic and soil conditions in the three main production areas of the country.