i know - zoysia!! i live in NJ. my front yard is zoysia, its been overseeded with fescue a few times... atleast 40% of the fescue holds each year.. but.... i get thick brown spots, they don't look diseased but seem to be dead zoysia. each year i rent a dethatcher and remove it.. but i still have thick spots of brown.. can anyone recommend ANYTHING to me.. killing the zoysia will be too much of an expense becaues i am concerned about damaging my sprinkler system. any help would be appreciated.. thanks.