Bark removed from an avocado trunk, revealing diseased wood that is brown, orange, or reddish due to branch canker and dieback, formerly called Dothiorella canker. The disease is caused by Phomopsis (=Diaporthe) species and various fungi in the Botryosphaeriaceae family.

Dothiorella canker, Botryosphaeria dothidea = Dothiorella gregaria. Brown and orange canker in wood on trunk of old avocado, exposed by hatchet. Riverside Co.  Credit: David Rosen
Credit: David Rosen