Summary of the genetic diversity of P. ramorum nursery isolates by state and year collected.

aFor each state and year the number of isolates sampled and the number of resulting multilocus genotypes (MGs) for each clonal lineage is given. For NA1 samples with 5 or more isolates, indices of diversity were calculated.bDiversity indices for NA1 samples: G, Stoddart and Taylor's genotypic diversity index; E5, index of evenness; GR, genotypic richness expected for a sample size of five isolates; AR, allelic richness expected for a sample size of five isolates.cSource of isolates: (1) C. Blomquist, California Department of Food and Agriculture; (2) G. Chastagner, Washington State University; (3) M. Garbelotto, University of California Berkley; (4) R. Leahy, Florida Department of Agriculture and Consumer Services; (5) R. Marra, Connecticut Agricultural Experiment Station; (6) N. Osterbauer, Oregon Department of Agriculture; (7) M. Palm, USDA APHIS; (8) J. Ristaino, North Carolina State University; (9) D. Rizzo, University of California Davis.