Mushrooms Around Your Aspen? It's Fairy Rings, Not Tree Disease

What You're Seeing

Mushrooms around one aspen, growing from roots. Other aspen clean. Sprinkler system in lawn.

Fairy rings = fruiting bodies of decay fungi decomposing grass thatch. Favored by irrigation (constant moisture). Not attacking the tree.

Only if tree foliage shows stress (off-color, thinning). Otherwise, purely a lawn phenomenon.

Plant Diseases: Mushrooms at Maple Tree Base: Harmless or Hazard?; Single Quaking Aspen Declining: Check for Root Pests or Cytospora Canker; Quaking Aspen Sudden Fall: Fungal Canker Suspected; Aphids on Aspen: Honeydew, Sooty Mold, and Organic Management; Quaking Aspen Powdery Mildew: Identification and Large-Tree Management; Sudden Aspen Decline (SAD) in Pacific Northwest: Beetle Link and Forester Help; Sudden Aspen Decline: Understanding Aspen Die-Off; Aspen Dripping Sap: Aphids, Not Tree Disease; Optimal Pruning Times for Red Oak and Maple Trees; Propagating Aspen Trees: Nursery Methods and Invasiveness

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