Black matter on BUSH

Asked April 13, 2016, 10:40 AM EDT

Can you tell me if this is harmful to a plant or what is it or needs to be done? Sorry if the picture is sideways.. Thanks Mary

Anoka County Minnesota black knot

1 Response

Dibotryon morbosum or Apiosporina morbosa is a plant pathogen, which is the causal agent of black knot. It affects the cherry, plum, apricot and Schubert chokecherry trees of North America. Prune off and dispose in your trash, do not compost.