St. Augustine Grass: Stolons, Brown Spots, and Common Problems

St. Augustine spreads via above-ground stolons (runners)—this is normal. Regular mowing at recommended height and periodic dethatching keep them in check.

Brown Spot Causes

• Chinch bugs—major St. Augustine pest.
• Grubs—root feeders.
• Brown patch fungus—cool-season (spring/fall) disease showing circular yellow/brown patches, often with green centers (doughnut pattern).
• Take-all patch—destructive fungus active in high moisture, moderate temperatures.

Preventive Practices

• Dethatch regularly to reduce pest/disease habitat.
• Fertilize consistently during warm months.
• Mow at proper height.
• Correct subsurface drainage issues, which often underlie disease in St. Augustine.

Identify the specific cause before treating—chinch bugs and fungal diseases require different approaches.