Black knot causes black swellings or galls on the branches. Branches with galls are pruned out. Powdery mildew causes a white coating on the leaves. Use benomyl to control the disease. Yoshino cherry may be subject to witches broom caused by Taphrina cerasi.
Branches are deformed and clusters of small branches form.
Infected branches bloom and leaf out earlier. Brooms are pruned out. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension.