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Canadian Cherry - gall #929707

Asked April 26, 2026, 8:08 PM EDT

Can you recommend a treatment that would eradicate the ongoing gall that forms on the tree branches every year. I have been pruning infected branches but the gall keeps spreading.

Franklin County Ohio

Expert Response

I assume that it is the black knot pathogen causing the issue.  You need to continue to prune out affected branches, but you can also spray a protective fungicide to reduce spread of the pathogen.  Any fungicide containing chlorothalonil or captan will be effective. Spray every 10 days now through mid June.

An Ask Extension Expert Replied April 27, 2026, 3:51 PM EDT

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