Dibotryon morbosum
（重定向自Apiosporina morbosa）
![](/Images/godic/202412/21/Black_Knot5935.jpg")
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. The disease produces rough, black areas that encircle and kill the infested parts, and provide habitat for insects.