Plum Trees

Plum Trees

renatenewman added on May 1, 2018 | Answered

Black knot on plum trees.

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Certified GKH Gardening Expert
Answered on May 2, 2018

This is likely a plum canker. Most years it will not affect much. Some years, when it is vigilant, it will wreak havoc on the tree. There is no cure for this, but you can treat it every year in spring with dolomitic lime and wettable sulfur.

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