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Control of Armillaria root rot through the use of resistant species, avoidance of hazardous sites, cultural manipulation, chemical applications, biological methods, and integrated biological methods are dis‐cussed. The need for a critical evaluation of disease impact and a financial analysis of control costs and benefits are emphasized. Avoiding establishment of plantations on sites likely to have a high disease hazard or the removal of substrate sources through uprooting stumps and dislodging root remanents currently appear to offer the most effective means of control.

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Root rot caused by Armillariellamellea (Vahl ex Fr.) Karst. creates unproductive disease centers in young-growth ponderosa pine (Pinusponderosa Laws.) after removal of the old-growth timber. The fungus persists in stumps in these centers keeping the land unproductive indefinitely. Armillariellamellea was effectively eradicated from infected stumps by insitu fumigation with methyl bromide, Vorlex, chloropicrin, carbon disulfide, and Vapam. The fungal antagonist Trichoderma appeared to be unaffected by the fumigants except for methyl bromide, which resulted in a significant increase in the incidence of Trichoderma over control stumps.

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