White fungal mycelium with a musty odor in the soil under the ring when active. Divide lawn into sections with paths or borders. Rings will grow out against these or against each other and disappear at points of contact. Use mutual inhibition method where rings are abundant. So far, there is no fungicide registered in Canada which, when applied to the turf surface, may be relied on to eradicate M. oreades rings.
Fumigant fungicides are more effective if the infested soil is disturbed and broken up.
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