I'm at a loss guys... The turf is fescue and is healthy and has been fertilized, we even have had rain in the last week! BUT. There are patches, some nearly 15 to 20 feet around that are this floruesent yellow color. I tried to take some pics with my camera but none of them really turned out well enough to hsow what I'm talking about. The last 3 apps of fert have been Lesco's 24-0-11 that has 2% Fe. Most of the lawns this happens in are in sandy soil. Is this simply an Iron problem??? I am actually getting complaints, plus it makes me sick to see this... Some of it I know is due to too much water, but there's not much that can be done about that. You either over water some spots or other spots dry up and die... I'm really thinking aobut buying some iron and spreading it over the yellow areas and hoping it helps... HELP!