problems with chokecherries
We are pruning our chokecherries to get rid of black knot and we noticed areas of infection on larger branches and trunks. We are not sure if this is black knot or what it is and if we need to cut the infected branches and remove them.Thank you.
Outside United States
Thank you for contacting us. From your photos, it is difficult to determine if the pictured areas are caused by black knot. The second photo looks like the bark was damaged, but it is possible the disease to attack the tree at that point.
Please see the following fact sheet for details that may help you identify the various stages of the disease. Also, you might look at question #349381 with related information. If you think the black knot is on the trunk or large branches, it may be best to remove the tree. Be sure to destroy the infected wood and disinfect your tools as described in the factsheet.