Then get one growing of the root stock Swingle.
Although trees used in the study were not infected with HLB, Killiny notes that Sugar Belle® trees with Swingle citrumelo rootstock produced the greatest amounts of two compounds known to have antimicrobial effects, quinic acid and ferulic acid. Consequently, it appears likely that Sugar Belle® will tolerate HLB best when grown on Swingle citrumelo, because the two acids would probably limit the bacterial population, or titer, in an infected tree. These results led the team to conclude that, among the three rootstocks tested, Swingle citrumelo is probably the best choice for optimizing greening tolerance in Sugar Belle®. (Citrus News)