Number of plants infected by Liberibacter psyllaurous in psyllids and graft- inoculated tomato after 24 hr, 76 hr or 6 days.

aLeaves from root stocks that were grafted to Lps-infected plants (Lps inoculated; N = 3) plants or uninfected scions (graft control; N = 3) were collected at 24 hr, 76 hr or 6 days after grafting.bLeaves from tomato plants (N = 3) that were infested with 25 B. cockerelli instars or adults, were collected at 24 hr, 76 hr or 6 days after infestation.cThe presence of Lps in B. cockerelli-infested or Lps-graft inoculated tomato leaves was detected by PCR (see Materials and Methods).