Start with the pattern
A single sharply defined spot, scattered patches and an entire sunny section turning brown can point to different causes. Note where the problem starts and whether it expands.
Check irrigation coverage
Run each zone and watch the actual spray pattern. A lawn may look as though it is being watered while one nozzle is blocked, misaligned or hidden by plant growth.
Look at moisture, not just color
A brown patch can be too dry or too wet. If the soil stays soggy long after surrounding areas dry, investigate irrigation or drainage before adding more water.
Consider insects or disease
Chinch bugs and fungal problems can affect St. Augustine turf. If irrigation and mowing look normal and patches continue spreading, a qualified lawn professional can help identify the cause.
Avoid treating before diagnosing
Adding fertilizer, fungicide or extra water without knowing the cause can waste money and sometimes make the problem worse.
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