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Virulence variations of Erwinia amylovora strains on immature pear. (A) Quantification of the sizes of the maceration area on immature pear fruits. (B) Virulence phenotypes of representative high‐virulence and low‐virulence strains. Photographs of the pears with maceration symptoms were taken at 8 days post‐inoculation and the sizes of maceration were quantified using ImageJ.
