Creeping Red Fescue Brown Patches: Fungus or Environment?

Southern California, zone 9-10, north-facing slope. Creeping red fescue gets brown patches that spread. Suspect fungus (dollar spot?). What to apply?

Diagnosis by Elimination

Lab confirmation costs. Instead, rule out:

If none apply, fungus is likely. But treatment is expensive—accurate ID (Extension lab) prevents wasting money on wrong fungicide.

Silver-dollar spots, cobwebby mycelium at dawn, favored by warm days/cool nights + low N. But creeping red fescue in SoCal? Uncommon host.

Don't guess-spray. Eliminate alternatives, then test if needed.

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