In the matter of control of HLB, the subject of study by several research groups has been the use of biological agents: predators, parasitoids or pathogenic microorganisms that are capable of decreasing the population densities of Diaphorina citri not only in areas where HLB is already established, but also in undersized areas where the high psyllid populations have not yet been subjected to such intensive spraying of pesticides. This project has contributed to the prospecting and characterization of pathogenic Bacillus thuringiensis (Bt) strains.