St. Augustine Yellowing After Brown Patch Treatment in Florida

Central Florida St. Augustine grass treated for brown patch with fungicide, then cornmeal, now shows yellowing after spring Scotts Turf Builder application.

Understanding the Yellowing

Yellowing is a normal brown patch symptom—the fungus damages grass blades, which must regrow. Do not fertilize or overwater; both aggravate fungal activity. Of ten common St. Augustine diseases, eight are fungal.

Recovery Protocol

• Pause fertilization and excessive watering
• Improve drainage and maintain soil pH below 6.5
• Apply preventative fungicides during active fungal temperature ranges (70-85°F)
• Spread fertilizer applications over several months; avoid heavy spring shots

Give the grass time to recover and push new growth. The cornmeal (horticultural corn meal) can help suppress fungal activity organically.