brown patch pretty much eats up fescue here in eastern nc. I stop fertilizing in Feb/March, but it doesn't matter. The heat, humidity, and afternoon thunderstorms will brown out a lawn in hours. It a battle and I'm considering offering a fungicide program which I think would be 3 monthly apps to prevent BP.
I may even do a 2 fall app and 1 spring app on my warm season in an attempt to preven large patch.