Evaluation of 13 Rootstocks for 3 Sweet Omage Clones for Tolerance to Tristeza Virus at Malama-ki. Hawaii
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1979
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Fifteen-year old 'Washington Navel', 'Valencia', 'Pera', and 'Ortanique' cultivars grafted on thirteen citrus rootstock species and hybrids were evaluated for tristeza tolerance at the University of Hawaii, Malama-Ki Experimental Farm. One hundred percent natural infestation of all experimental trees was detected and confirmed by use of Immunodiffusion test and the viral inclusion staining technique. Cultivars grafted on sour orange, 'Sampson' tangelo and Citrus amblycarpa rootstocks were lost due to tristeza prior to 1972. 'Batangas' and rough lemon were rootstocks that produced the most vigorous growth. 1978 seasonal production was high with trees on rough lemon, 'Batangas', 'Rangpur', 'Kona orange', 'Cleopatra' and Citrus sunki. Upright growth habit was observed with trees on 'Cleopatra' and 'Rangpur' rootstocks. The best quality fruit was harvested from trees grafted on Citrus sunki and 'Cleopatra' rootstocks. 'Heen naran' performed well with 'Washington Navel' but was not a satisfactory rootstock for the other three cultivars. In this experiment, Citrus taiwanica, 'Siamelo' and 'Troyer' were not desirable rootstocks due to poor production. Citrus amblycarpa, 'Sampson' tangelo and sour orange were not suitable rootstocks for oranges and mandarins because of their susceptibility to tristeza virus.
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