Invitro, Hx concentrations over 0.6 mM in LB medium delay xcc growth. Results indicated that Hx delayed entry of the bacterium into the stationary phase, but did not reduce the size of bacterial population. The L assay demonstrated that the growth inhibition was a bacteriostatic effect. In detached citrus leaf inoculations, Hx at 1.0 and 3.0 mM reduced lesion number and viable