PCR-ribotype fingerprints of E. amylovora strains isolated from tree fruits (Ea110, NZR5, CA263, OR6, and CA1R), hawthorn (IH3-1), and Rubus spp. (IL-5 and MR1) and three strains of E. pyrifoliae (Ep1/96, Ep4/97, and Ep16/96) isolated from Asian pear.