Could be neither, could be localized dry spots. Best to post a picture and get a solid identification before you start putting stuff on your lawn.

If it is fungus, regardless of what you've read, corn based products aren't going to help. Even the folks on the organic lawn care forum don't recommend cornmeal for fungus problems. Results just aren't there.

I'll post a pic tomorrow but it's definitly not dry spots. My irrigation system waters it just fine and I also tried localized watering in addition to my normal sprinkler settings to rule out lack of water. Yeah I'm reading mixed reviews for treating fugus with cornmeal but figure I need to fertilize either way so might as well put it down. Just wasn't sure if I can put CGM and nematods at the same time. thanks for the response!

I think you can check for grubs by simply digging up the patch and seeing if there's grubs there. I'm not an expert though, I don't have grub problems.

Dig up 1 square foot of sod and count the grubs you see. If there are fewer than a dozen, don't treat for grubs. If there are an uncountable mass of grubs, then treat it with beneficial nematodes.

Post a picture so we can vote on whether it's a fungus or not.

Where do you live?

What kind of grass do you have?

I'm in Michigan and I checked for grubs tonight in three spots and found none so it must be fungus

I put down CGM at 20lbs per 1000sf on the entire lawn regardless if it's an area with fungus or not since it it's been a few months since I fertilized but my question is what else can I do? I want to treat the fungus but not ruin my efforts over the last two years to go organic. I'm in Michigan, lawn drains well, is watered well so I'm not sure what the issue is. I better change the title of this thread since I now know it's fungus.

Don't cut off your nose to spite your face. Being organic is great, it's a goal for many of us. But don't lose your lawn just to stay organic - "here lies my organic dirt" just does not appeal to me. CGM does not help with fungus. You may be thinking about corn meal, the two are fairly different. There is much debate about cornmeal working for fungus. If your problem is indeed a fungus j4c11 usually recommends Heritage or Headway fungicide - I think, don't quote me on that (wait for his input).

Thanks for the advice Hawksster and I definitly don't want to do that but also don't want to go back to square one :). I'll check out Heritage and or Headway in case j4c11 doesn't chime in

Okay, I panicked because I wasn't finding Headway G locally and put down Scotts Lawn Fungus Control. It was getting worse and worse so had to move fast. I've ordered Headway G so I'll have it on hand next time. I hope Scotts is not going to kill all the micro organisms I've been working on building since I started my organic program two years ago?

It will kill a lot of fungi, that's what it does, but the population will recover quickly. If it didn't, you wouldn't have to keep applying fungicide every 14-30 days.

yep, I assumed it would kill fungi but wasn't sure about other organisms and pests. Do you guys typically apply fungicide(Headway G) before you see any symptoms? My problem is I wait until it's apparent then apply but last year I didn't have any issues.

I think it's safe for bacteria etc. Ideally fungicides should be applied preventively, they enter the grass and protect it from infection from the inside. If you're into organics, that may not be something you wish to do since it does affect the fungi population. It's up to you to balance that and make a decision - for me, since I don't feed organically, I'm just going to start on a preventive fungicide plan in May next year and keep it going through September.