Brown Patch Overtakes St. Augustine
This fungal disease is primarily one of autumn’s cooler weather in Texas. It first appears when temperatures begin to drop into the 60s at night, especially when there has been rainfall or evening irrigation. It is spread in cool, moist conditions.
The best way to confirm brown patch is to pull gently on affected blades. If they separate easily from their runners, and if they are browned and rotted at their bases, that’s brown patch.
You can slow the spread of the disease by watering only in the mornings. Bayleton and other registered fungicides will stop its spread. Since it is a disease that only affects leaf blades, the runners will remain alive throughout. If enough warm fall weather remains the affected areas will green up again. If not, you’ll be able to see its impact all winter long.