Ohio State Extension says grass blades that are damp for as little as 12 hours are more prone to brown patch. Watering in the evening encourages that threshold by keeping the grass damp overnight.

If brown patches suddenly pop up in your lawn in the middle of summer, the most likely culprit is a fungal disease called, "brown patch." Grass turns brown when it's no longer receiving the proper ...

Fortunately, there are simple fixes for brown patches in your lawn. If you have an infestation of the brown patch fungus, remove the grass already killed by it so that the fungus does not spread.