Several citrus tristeza virus tolerant rootstocks budded with Washington navel orange were evaluated in Aguirre, Carabobo State, Venezuela. Yield results of 7 yr are presented. Other parameters taken into consideration were: canopy volume, efficiency, fruit size, peel width, percent of juice, total soluble solids (TSS), percent acid and TSSIacid ratio. From the preliminary results the most promising rootstocks seem to be Volkamer lemon, Citrus taiwanica and Carrizo citrange. The selection of a single rootstock would not be possible nor recommended due to the different climatic and soil conditions.
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.
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