Evaluation of Twelve Rootstocks for Dwarfing Citrus1

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Abstract
The influence of 12 rootstocks on the performance of a sweet orange seedling and ‘Valencia’ orange (Citrus sinensis (L.) Osbeck) was evaluated in a study to determine their effect on eventual tree size. Trees on some rootstocks were larger than those on rough lemon, the standard for comparison, but a few were smaller and might be considered for closer spacings. The trifoliate orange selections (Poncirus trifoliata (L.) Rof.), particularly ‘English small’ merit consideration since yields were high in proportion to tree size and fruit quality was good. Results with ‘Rusk’ citrange (P. trifoliate × C. sinensis) were also quite satisfactory because the trees were semi-dwarf in size and had relatively good yields of high quality fruit of acceptable size. ‘Troyer’ and ‘Car-rizo’ citranges would be suitable candidates for ‘Valencia’ orange, based on this study, if semi-standard trees are desired. The performance of trees on some rootstocks was probably influenced by the sandy soil and the dwarfing effect could be more environmental than genetic.

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