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Brown spot can be a name for several diseases. The Web Link 'Diseases' will help to ascertain which it is exactly. Usually, it is a name for bacterial spot. If so, check the second link 'Bacterial Spot.' One treatment for the latter disease is copper sprays while the plant is dormant, at both early and late dormancy. Control is not easy.

Brown rot is the other common plum disease, and is treated with fungicides.

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18y ago

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