Pest: Armillaria Root Rot (Oak Root Fungus) (Armillaria mellea)

Pest Type: Infectious disease, fungi

Major Identifying Features: Armillaria is a soil-borne fungus that causes a root and trunk rot of avocado, infected trees die prematurely, young trees die quickly, wilted and downward hanging foliage is mostly the first sign of infection, foliage yellowing, leaf drop, dieback of upper limbs, groups of short-lived mushrooms accumulate at the base of trees during winter months

Life Cycle: Armillaria persist for years under the bark of diseased roots or the root crown and spreads by any activity that moves soil, fungus can also spread from tree to tree by rhizomorphs

Pest Rating: Moderate

Management Rating: Difficult

Host/Season/Outbreak Information: Armillaria fungi live in the soil and remain for a long period of time after an infection

Damage Information: Can kill young trees, infects many crops and native, and ornamental plants including avocado,cherimoya, citrus, and oaks

Management Options: Prevention by choosing plants that are not susceptible to Armillaria, cultural practices and good sanitation, good drainage and avoiding excess irrigation, mechanical control by removing all invested parts including stumps and roots



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