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Bacterial Spot of Stone Fruit
Bacterial spot occurs in most countries where stone fruits are grown. Common hosts include peach, nectarine, prune, plum, and apricot. Other hosts are sweet and tart cherry, almond, and wild peach. Varieties within Prunus species vary widely in their susceptibility to this disease. Other names for the disease are bacteriosis, shot hole, and black spot. The causal bacteria, Xanthomonas campestris pv. pruni, can attack fruit, leaves, and twigs. Fruit loss on some varieties can be very high. Early and severe defoliation can affect fruit size and the winter hardiness of buds and wood.