How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Armillaria

Armillaria thrives under moist conditions, for example when irrigated turf is planted around the roots of California native oaks. Plants become infected through root contact with infected plants or rhizomorphs attached to infected roots. Armillaria root rot can develop slowly, and symptoms may not appear until the fungus is well established. The fungus can survive for many years in dead or living tree roots.


Rhizomorph with healthy root
Rhizomorph (top) with healthy root

Statewide IPM Program, Agriculture and Natural Resources, University of California
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