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Fig. S1 Validation of the single nucleotide polymorphism (SNP) marker on Erwinia amylovora strains that were used for sequencing of the avrRpt2EA gene (Fig. 5).

Fig. S2 Presence and expression of the two avrRpt2EA alleles in the wildtype strains Ea898, as the originally wildtype strain of the mutant (C-allele), and Ea110 and Ea3050 (both with an S-allele).

Table S1 Description of additional Erwinia amylovora strains analyzed for the single nucleotide polymorphism (SNP) at position 644, leading to the amino acid exchange from serine to cysteine at position 156