Abstract
The best indicator of trends in citrus rootstocks in Florida is the statistics of registered trees in nurseries collected by the Bureau of Citrus Budwood Registration of the Florida Department of Agriculture and Consumer Services. In 1992, 45.8% of these trees were on Swingle citrumelo (Citrus paradisi Macf. × Poncirus trifoliata [L.] Raf.), 27.9% on Carrizo citrange (C. sinensis [L.] Osbeck × P. trifoliata), 14.8% on Cleopatra mandarin (C. reticulata Blanco), 4.8% on miscellaneous rootstocks (mostly numbered citrumelos and Rangpur × Troyer (C. reticulata hybrid × [C. sinensis × P. trifoliata]), 3.2% on sour orange (C. aurantium L.), 1.9% on Volkamer lemon (C. volkameriana Wester), and 1.2% on rough lemon (C. limon [L.] Burm. f.). There are no official statistics on the rootstocks of existing, mature citrus groves; estimates are 35% on Carrizo, 25% on rough lemon, 20% on sour orange, and 15% on Cleopatra. Very few groves are planted now because of overproduction and depressed prices. In rootstock tests under way, Benton citrange (C. sinensis × P. trifoliata), pummelo × trifoliate orange (C. maxima × P. trifoliata), and Changsha mandarin × trifoliate orange (C. reticulata X P. trifoliata) hybrids look promising.
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