Brown Patch Fungus in St. Augustine: When Treatment Fails

The Scenario

A Jacksonville, FL lakefront lawn diagnosed with brown patch fungus was treated twice by a lawn company with no improvement—spread continued. After a hard freeze, the entire lawn is brown with minimal green.

Recovery Outlook

Full recovery is unlikely. Repeated treatment failure suggests misdiagnosis, wrong product, incorrect rate, or poor timing. St. Augustine is susceptible to brown patch (Rhizoctonia), but other issues—take-all root rot, chinch bugs, cold damage—mimic symptoms.

Critical Next Step

Obtain an accurate diagnosis from your County Extension Agent. They provide science-based identification and tailored recommendations. Only then can you plan effective renovation or treatment.

Lesson

Don't assume a diagnosis is correct if treatments fail. Professional lab analysis or expert field diagnosis saves money and time versus repeated blind applications.