Figure 1. Polymerase chain reaction analyses of ‘Candidatus Liberibacter asiaticus’ isolates from Florida using primer set that amplifies Motif A-containing locus.

Letters and numbers on top designate the following lanes: M, DNA markers; C-, control DNA from a healthy plant; C_HA and C_HB, positive controls obtained by using DNA from plants known to be infected with the HA or HB haplotypes, respectively; 1–9, various samples from Florida. Note double bands in lines 2, 3, and 6. Numbers on the right indicate DNA fragments sizes.