15 July 2010

Re: Black Knot Disease

black knot on local Schubert Chokecherry Trees

As per my previous post regarding Black Knot on Schubert Chokecherry Trees (prunus), I have confirmed with a horticulturist that it is not necessary to wait until the trees are dormant to prune out the disease.  Please, do it now.  Cut at least 8 inches below visible signs of infection, disinfecting your tools between each cut.  A 10% bleach or alcohol solution will kill traces of the disease.

For photos and more information on Black Knot see

If you see this in your municipality, feel free to contact the horticulture department so they may address the problem.

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