In vitro, 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 LIVE/DEAD® 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
and total Xcc populations. In attached leaf inoculation of plants,
both soil drench and foliar Hx spray applications reduced the
number of lesions produced by Xcc. Hx produced a similar reduction
in lesions and the bacterial population as ASM. These disease
control effects are consistent with those reported