Cankers are sunken areas in the bark that gradually get larger. When the stem is completely encircled the part beyond the canker dies. There is no chemical control for canker diseases. Keep the plants healthy by fertilizing and watering during dry weather. Cankers can be prevented by avoiding plant injury.
Root rots caused by several fungi kill roots and rot wood.
Little can be done to control the diseases other than to keep trees healthy. Maintain tree health by regular fertilization and watering during dry weather. 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.