Rangpur Lime x Troyer Citrange

J. R. Furr made pollinations between Rangpur lime and Troyer citrange in the USDA citrus breeding program at Indio, California, in 1953. UCR’s Citrus Variety Collection records receipt in 1988 as budwood from Florida’s Budwood Registration Program at Winter Haven; the accession is CRC 3997 / PI 539831 / VI 483. The 1986 Florida paper identifies selection C54-64-8 as the seed source for its Florida experiments but does not establish it as the same accession.^⁠[5]⁠[1]

The 1986 paper’s fruit and yield account concerns four seedling trees near Davenport; it describes medium-to-small, yellow, pear-shaped fruit with 10–20 seeds. Citrus ID and Malcolm Manners also describe fruit under the hybrid name without identifying a specific accession. One video reports a single unripe fruit that its speaker said was not suitable for a taste test. That clip does not document a ripe-fruit sensory evaluation.^{⁠[5]⁠[6]⁠[9]⁠[10]}

The 1986 Florida paper evaluates Rangpur × Troyer as a rootstock: field trials report early bearing by grafted scions and Valencia yield/solids by irrigation treatment. It also describes unprotected Davenport seed trees with minor freeze damage and moderate cold injury in grafted trees farther south, without exposure temperatures. Controlled tests reported tristeza tolerance; limited field observations found low blight incidence, while xyloporosis status was unknown. Malcolm Manners later relayed a conflicting tristeza-susceptibility account without an identified accession or test method; the conflict remains unresolved.^⁠[5]⁠[9]