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Black Rot on Plum Trees

Plum is an easy to grow fruit and comes in European and Japanese varieties. The trees bloom late, which makes them less susceptible to damage from spring frosts. Use two different varieties for best fruit production. A fungal infection causes black rot on trees.

  1. Identification

    • Plum trees are susceptible to the black knot disease caused by the Dibotryon morbosum fungus. Left uncontrolled, the infection continues to get worse over time and eventually kills trees. Infected trees get weaker, less productive and more prone to winter damage.

    Damage

    • The disease starts with the appearance of rough, soft, green knots or tissue swelling on woody tree areas. Small branches and twigs are most affected. With age, the knots turn brown and then black. Larger knots are up to 1 foot or more in length. The knots are covered with white or pink fungal growth. As disease progresses, the knots girdle affected branches and twigs and the fungus spreads in the wood.

    Management

    • Prune and remove all affected branches and twigs, making cuts several inches below the knots. Use resistant plum varieties. Fungicidal control options include the use of mancozeb, chlorothalonil or copper hydroxide.

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Growing Grapes
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  4. Bruce & Methley Plum Trees
  5. Tree Diseases, Fungus and Black Rot
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  7. Black Knot Control in Plum Trees
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  11. Black Rot in Helleborus
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