Having spent the last two days looking at spots that people thought were “Brown Patch”. Here’s the deal. Brown patch on cool season grasses requires thes items: Water, heat, warm nights, humidity. If one of the above is unavailable for the fungus, it can’t develop. Currently, it’s WAY TO DRY for cool season brown patch! How can you tell if its just drought stress? Can you easily push a Phillips head screwdriver into soil to the handle? Does your grass look skinny and round bladed? Fescue blades with adequate moisture ate generally flat. As drought stress arrives, the blades will roll into circle (to conserve moisture I believe).