Hungarian 
Finding a cure has been challenging due to the complexity of the Candidatus Liberibacter asiaticus (CLas) bacteria interactions with the citrus host and the Asian citrus psyllid. Another factor that has made it hard to recover from the disease is the tendency of the citrus industry to focus on a small number of cultivars with commercially desirable traits, but little genetic diversity.
Researchers who are working to find a citrus cultivar that is HLB resistant have a choice of either adding genetic variation through breeding with distant relatives or modifying the trees transgenically. In an article published in the Journal of the American Society for Horticultural Science, scientists present promising results from transgenic populations that produce antibodies that can bind with CLas proteins and reduce the bacteria’s ability to replicate.
However, a greater understanding of the disease progression will likely be needed to determine what factors cause the observed divergence in resistance levels.
Related case: