Last fall around mid October I noticed areas in a customers yard were the turf had been pulled back. Other areas I could pull the turf right up. Sounds like classic examples of grubs. Only thing was I couldn't find any. At least not enough to cause that type of damage. I've read it takes like 10-12 per square foot to cause this type of damage. Is there another insect, animal or fungus that could cause the same damage. Thanks.