Lawn Fungus Control in South Florida

South Florida’s combination of heat, humidity, and frequent rainfall creates near-perfect conditions for lawn fungal disease — especially during the summer rainy season. Brown patch, gray leaf spot, and dollar spot are the most damaging, and they can destroy large sections of lawn in a matter of days if not treated promptly. Bugsy’s professional fungicide program identifies the specific disease and applies the right treatment before damage becomes irreversible.

According to UF IFAS turf disease research, fungal diseases in South Florida turfgrass are primarily driven by three factors: overwatering, incorrect fertilization timing, and mowing too low. Bugsy’s treats both the disease and the cultural conditions making your lawn vulnerable.

Common Lawn Fungal Diseases in South Florida

Brown Patch (Rhizoctonia solani)

Brown patch is the most common lawn disease in South Florida, appearing as circular or irregular brown patches 6 inches to several feet in diameter. It’s most active in fall and early spring when overnight temperatures drop below 70°F after humid days. It affects all South Florida grass types but is most severe in St. Augustine.

Gray Leaf Spot

Gray leaf spot is a summer disease that devastates St. Augustine grass, turning blades gray-brown with distinctive oblong lesions. It thrives when temperatures exceed 80°F with high humidity and frequent rain — which is most of the South Florida summer. Incorrect nitrogen fertilization during peak humidity dramatically worsens outbreaks.

Dollar Spot

Dollar spot creates small, straw-colored circular spots 2–4 inches in diameter, often with a cobweb-like mycelium visible in morning dew. It’s most active in Bermuda and Zoysia grass when nitrogen levels are low. Unlike brown patch, dollar spot is a sign of under-fertilization rather than over-watering.

Take-All Root Rot

Take-all root rot is an aggressive, difficult-to-control disease that attacks St. Augustine and Bermuda root systems. Symptoms include yellowing turf that doesn’t respond to fertilization and roots that are black and rotted. It’s most common in spring and fall and often occurs after extended drought followed by heavy rain.

Helminthosporium Leaf Spot

A common Bermuda and Bahia grass disease producing small, brown oval lesions with purple borders. Severe outbreaks can cause significant thinning and bare spots.

Our Fungus Treatment Approach

Accurate Disease Identification

Different fungal diseases require different fungicides — applying the wrong product is ineffective and a waste of money. Bugsy’s inspection identifies the specific disease based on symptom pattern, grass type, season, and cultural conditions. Per UF IFAS, accurate identification is the first and most important step in disease management.

Curative Fungicide Application

For active disease outbreaks, we apply systemic fungicide products that are absorbed into the plant tissue to stop the disease from spreading. We rotate fungicide chemistries to prevent resistance development — critical for long-term disease management in South Florida.

Cultural Recommendations

We’ll identify any cultural factors contributing to the disease — typically overwatering early in the day, mowing too low, or excessive nitrogen fertilization during humid periods — and provide specific recommendations to prevent recurrence.

Frequently Asked Questions

How do I know if my lawn has fungus or insect damage?

Fungal damage tends to create circular or irregular patches with distinct color patterns (often gray, brown, or orange tones) and may show mycelium in morning dew. Insect damage typically has grass that’s been consumed — you can see bare soil or very short, ragged grass blades at the damage edge. Our free inspection will identify the cause precisely.

Will my lawn recover from fungal disease?

In most cases, yes. With prompt professional treatment and correction of any underlying cultural issues, most South Florida lawns recover fully within 4–8 weeks. Severe or long-standing infections may require overseeding or sodding to repair damaged areas.

How do I prevent lawn fungus?

Water in the morning so grass dries during the day. Avoid watering at night — fungal spores germinate in wet, dark conditions. Mow at the correct height for your grass type. Avoid high-nitrogen fertilization during peak summer humidity. Our lawn care program addresses all of these factors.

Get a Free Lawn Fungus Control Estimate

Ready for a healthier, greener lawn? Bugsy’s Pest Solutions is a veteran-owned, family-operated company serving Palm Beach and Broward counties. Call (561) 654-8998 or request your free lawn care estimate online. We serve Lake Worth Beach, West Palm Beach, Boca Raton, Boynton Beach, Delray Beach, Jupiter, Coral Springs, Pompano Beach, and all of South Florida. View our full service area.