What do you guys use to spray for brown patch, fairy rings, dollar spots & grubs? How is the best way to tell the difference between grubs & brown patch. I only have one yard that has major problems. There are a few brown rings (4-6) And about a dozen large patches of brown dead grass. Havent yet been able to tell the difference between brown patch, grubs & fertilizer burn. The only thing I can think of to see what caused it was the yard had been fertilized about a week before heavy rain storms....then several weeks following were full of rain and humid nights. The fertilizer was a Lesco iron 5-10-31 I think.