centipede lawns with dead spots? i have 32 accounts and nearly all are centipede lawns. some i weed and feed, others i don't. almost every one has several dead sections of about 10 square feet. we have had avg rainfall so far and i mow these yards at about three inches just as i always have. this is the first i've seen this and even my comp. has mentioned it. anyone have an idea of what the heck is wrong?