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What is this #928339

Asked April 14, 2026, 10:13 AM EDT

What is the black thing on this tree limb?

St. Mary's County Maryland

Expert Response

The object is not in focus, but it looks like Black Knot, a very common fungal disease of wild and flowering cherries and plums. It's not treatable once the symptoms appear, but if found on a tree in your yard, it can be pruned off and thrown out (don't compost the infected twig).

Miri

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