US-1279, US-1281, US-1282, US-1283, and US-1284 are new citrus rootstock cultivars released in Sept. 2014 by the Agricultural Research Service (ARS) of the U.S. Department of Agriculture (USDA) (Bowman and McCollum, 2014a, 2014b, 2014c, 2014d, 2014e). Compared with other common citrus rootstock cultivars used in the east coast region of Florida, when grafted with sweet orange scion, these rootstock cultivars produce trees that have superior production of good quality fruit after the trees are infected with Candidatus Liberibacter asiaticus (Las), the believed causal agent of huanglongbing disease (HLB). All five rootstocks,when graftedwith common commercial citrus scions, produce mediumsized trees and appear adapted to production on the flatwoods soils of the Florida east coast. Seed is not available for these rootstocks, but they propagate readily by semihardwood cuttings on a mist bench.
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Bowman et al. (2015) studied this question.