Brown spots are typically caused by poor soil conditions or improper sprinkler coverage. Brown spots can also be caused by insect or disease activity.
- Be sure that your spray heads are properly adjusted (they seem to change often).
- Check if any of the heads are blocked due to soil particles or grass roots closing the openings.
- Prune any plants or grass that may be blocking the spray pattern.
- Manually water the brown spots several extra times during the week until it greens up again.
- Set your timer so that all your water is not running off into the streets but soaking in. You may need to decrease the watering time but increase frequency of watering.
- If you water when you see irregular bluish gray patches in your lawn, they will green up quickly. If you wait until they turn brown it will require 3-6 weeks of consistent watering to bring it back.
- Place a flat bottom bowl (like a cool whip container) in the dry spot and another in the green grass. Run the water cycle and compare the amount of water in each container. If the brown spot contains less water, you know it is a watering problem and adjust your irrigation system accordingly.