ok not a lawn expert here but know you can treat powdery mildew with milk or a fugaside(spl wrong)can use any kind of milk just do a 50% thing with it.need better air circulation or maybe dethatch your lawn so air gets to the roots.they make grass seed that is PM resistant.i know KY bluegrass will grow there
good luck

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Don't know what kind of grass you have but when I get it in bermuda in Tx, I use a fungicide and it helps to cut it low and blow the cuttings and thatch out of it so the roots can breathe. You can clean your mower with diluted clorox and water. If you rinse it out after every use, you can avoid alot of the fungus problems. Lawn services are the most widely source of fungus problems. At the beginning of the growing season I cut it short and blow all the thatch out and put fungicide out twice a year to combat fungus and brown patch etc. during the growing season. In Tx especially during our hot summers, we face alot of brown patch, grub worms, fire ants and just about everything else a lawn can get it seems like. Remember fungus is like a mold and it needs a moist place to grow, and the more air that circulates through the roots, the better off your grass will be.