Armillaria is a soil-borne fungus that causes a root and trunk rot of avocado. The fungus can become well established in roots and the root crown before any symptoms become visible above ground. Infected trees usually die prematurely, and young trees often die quickly after infection.

How do you stop Armillaria root rot?

Sadly, there is no absolute treatment for Armillaria root rot. The disease can be managed by the consistent removal of dead trees and infected stumps. Armillaria requires consistent moisture to survive, and in citrus groves, excavation around the root crown has been an effective deterrent but not an ultimate cure.

What plants are affected by Armillaria root rot?

Armillaria root rot is a disease of trees and woody plants, although it also affects palms, succulents, ferns and other herbaceous plants. This disease is caused by fungi in the genus Armillaria, also known as “oak root fungus,” although the fungus has no specificity for oaks.