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Evaluation ratings of cold injury following a freeze on December 24 &amp; 25, 1989, showed differences among scion cultivars and rootstock. `Star Ruby' grapefruit (Citrus paradisi Macf.) and `Fallglo' citrus hybrid, a cross of Bower mandarin citrus hybrid × Temple tangor (C. temple Hort. ex Y. Tanaka) were the most severely damaged scion cultivars. `Rohde Red' valencia orange selection 472-11-43. [C. sinensis (L.) Osbeck]. was the least damaged scion cultivar. Scions budded to Cleopatra mandarin (C. reshni Hort. ex Tan.) and FL 80-18 citrumelo [C. paradisi × Poncirus trifoliata (L.) Raf.] rootstock were damaged more than on other rootstock. Scions budded to smooth flat seville (C. aurantium?) and P. trifoliata × Ridge pineapple sweet orange selection 1573-26 [C. sinensis (L.) Osbeck] had the least injury. Analysis comparing replications showed the greatest damage to be in the north side of the planting.

INJURY TO 27 CITRUS CULTIVARS ON 22 ROOTSTOCKS AT ONE-YEAR-OLD EXPERIENCING MINIMUM TEMPERATURE OF -4.4C