What exactly is summer patch? What is the cause & how is it treated? I was giving a mowing/landscaping estimate today for a customer who just moved in. Apparently the lawn had bad case of it last year & the previous owner just let it go. Instead letting their applicator treat it. It is in a upscale neighborhood, so the dead spots look really bad in the lawn. I can't apply anything to it thats what the other guys are for but what recommendations do you guys have? I'm curious to learn more about it. Thanks.