Phylogram of the 16S ribosome and ITS region. Included in this phylogenetic tree are the isolates from chitalpa obtained from New Mexico, Arizona, and California. The sequences for the subgroups pierci, multiplex, and pauca were taken from Schaad et al. (38), and the sequences obtained from GenBank are noted with the GenBank accession numbers. The maximum-likelihood method using PAUP 4.0 was utilized to make the tree. The tree was bootstrapped 1,000 times, and bootstrapping consensus percentages are shown on the tree with Xanthomonas as the outgroup.