What Is Large Patch Fungus?
Large Patch is caused by the soil-borne fungus Rhizoctonia solani, which thrives in warm, moist environments — exactly the kind of conditions Manatee County offers in early fall. The fungus stays dormant through the heat of summer and becomes active again once soil temperatures drop below 80 °F, usually in October and November.
It primarily affects St. Augustine grass and Zoysia grass, all of which are popular in our Gulf Coast landscapes.
How to Spot It
Early signs often appear as:
- Circular brown or orange-tan patches, sometimes several feet wide.
- A yellow halo around the edge, or a “donut” ring of healthy grass in the middle.
- Blades pull up easily from the stolon’s and show rotted, orange-brown bases.
Large Patch often starts in shady, low-lying, or over-watered areas — and spreads quickly if moisture lingers overnight.
Why Fall in Manatee County Is Prime Time
After a long rainy season, our soils stay saturated well into October. Combine that with cooler nights, heavy dew, and lawns still recovering from summer stress, and you have perfect conditions for fungal growth.
Prevention and Management
1. Water Wisely
- Follow watering schedule between 2am and 4am
- Water deeply but infrequently, giving the lawn time to dry between cycles.
- Avoid watering in the evening when moisture lingers overnight.
2. Fertilize Smart: Using Westfall’s to maintain your monthly fertilization
3. Mow Correctly
- Raise your mower deck slightly to reduce stress on the grass.
- Never mow wet grass — it spreads fungal spores.
- Keep blades sharp to prevent tearing.
4. Improve Conditions
- Rake fallen leaves and clear debris to improve airflow.
- Check for low, soggy areas and improve drainage if possible.
5. Call Westfall’s to handle your lawn and fungus needs. 941-761-0125