If you've ever seen circular brown patches appear in your Myrtle Beach lawn overnight in summer, you've encountered lawn fungus — and you're not alone. Fungal lawn disease is one of the most common problems for Horry County homeowners, and the coastal climate makes it almost inevitable if you're not managing for it.
Why Lawn Fungus Is So Common in Coastal SC
Fungal disease thrives in exactly the conditions that define Myrtle Beach summers: high humidity, warm overnight temperatures above 70°F, moisture on grass blades overnight, and poorly circulating air in dense turf. From June through September, the Grand Strand provides ideal conditions for fungal pathogens every single night.
The Most Common Lawn Fungi in Horry County
- Brown patch (Rhizoctonia solani): The most common — circular or irregular brown patches ranging from a few inches to several feet. Appears suddenly after humid nights and expands rapidly in hot, wet weather
- Dollar spot: Small, silver-dollar-sized brown spots scattered across the lawn — common in Bermuda and Zoysia during hot, dry periods followed by heavy dew
- Large patch: Similar to brown patch but affects Zoysia and St. Augustine specifically — creates large irregular tan patches
- Pythium blight: Most destructive — appears as greasy, dark patches that collapse quickly. Spreads fast along mowing patterns
Check your lawn early in the morning before the dew dries. Fungal disease typically shows a white, cottony mycelium at the edge of active patches in the early morning hours — this is the clearest sign you're dealing with fungus rather than drought stress or pest damage.
What Causes Fungal Disease to Spread
- Watering in the evening — wet grass overnight is the primary trigger
- Overwatering — coastal SC sandy soils drain fast but surface saturation promotes fungal germination
- Mowing wet grass — mower blades spread fungal spores across the entire lawn
- Dull mower blades — torn grass blades create entry points for pathogens
- Excess nitrogen fertilizer — fast lush growth is more susceptible to fungal infection
How to Treat Lawn Fungus in Myrtle Beach
- Apply a fungicide labeled for the specific pathogen — contact Bakerss for identification help
- Switch all irrigation to early morning — grass should be dry before nightfall
- Reduce irrigation frequency until the outbreak is controlled
- Avoid mowing affected areas until treated and dry
- Do not fertilize during an active outbreak — it accelerates spread
Preventing Fungal Disease in Coastal SC
- Always water early morning — between 4am and 9am is ideal
- Aerate annually — compacted soil holds moisture longer and promotes fungal conditions
- Maintain proper mowing height — don't scalp the lawn
- Apply preventive fungicide in late May before peak fungal season
- Choose fungus-resistant grass varieties — Zoysia is generally more resistant than St. Augustine in Horry County conditions
Dealing with lawn fungus? Contact Bakerss — we can assess your lawn and help determine the right treatment approach for your specific turf type and situation.
