Abstract
Huanglongbing (HLB) is the main phytosanitary problem of citrus in several countries, including Brazil. Caused by proteobacteria Candidatus Liberibacter spp., the symptoms of the disease have been related, in part, by the accumulation of callose and phloem 2 (PP2) proteins in the tubes of sieved elements of the phloem of infected plants. This accumulation of PP2 proteins would be possibly…