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Virulence assay on crab apple (Malus mandshurica) flowers. Symptoms of crab apple flowers at 6 days post‐inoculation with Erwinia amylovora strain Ea273, dspE mutant, Ea273 treated with dimethylsulphoxide (DMSO) or compound 3 at 50 μm. Photographs were taken at 6 days post‐inoculation. The experiments were repeated three times with similar results. Arrow indicates representative inoculation site (stigma) and symptoms below on style and ovary.
