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Adjacent but separate trials of 'Oroblanco' and `Melogold', both triploid pummelo [Citrus grandis (L.) Osbeck] x grapefruit (Citrus paradisi Macf.) hybrids, were established on nine rootstocks in the Indian River citrus region of Florida in 1993. The trees on the citrandarin rootstock x639 [Cleopatra mandarin (C. reticulate Blanco) x trifoliate orange (Poncirus trifoliate L.)] were significantly more productive than trees on any other rootstock tested for `Oroblanco' and all rootstocks except Swingle citrumelo (C. paradisi x P. trifoliate) and Cleopatra mandarin for `Melogold'. Cumulative production of 'Oroblanco' on x639, through year 9, was 50% higher than for Swingle or Volkamer lemon [C. limon (L.)], which were the next highest in yield. `Melogold' displayed extremely low yield, with 45% of trees producing fewer than 50 fruit total in the 9 years of this study. Carrizo citrange (C. sinensis Osbeck x P. trifoliate) produced the smallest trees with both scion varieties, reflecting poor adaptation of this rootstock to the calcareous soil at the trial site. As expected, acidity of 'Oroblanco' and `Melogold' was much lower than would be observed for grapefruit when fall harvested, with similar total soluble solids (TSS), and much higher TSS; titratable acidity ratio. Some rootstock effects on internal quality were observed. [ABSTRACT FROM AUTHOR]