Really hard to say from a distance. Could be Poa A coming in or some summer weed on its way out. Need close up.

Umm I am going to put down my Fall/Winterizer turf builder from Scotts as I do every Fall tomorrow , I was wondering if it is a Iron deficiency or nitrogen, what do you think? I don't think its a fungus

Without a close-up picture, I can't offer any opinion on what it could be. We need to see those grass blades.

I will take a close up pic tomorrow, going to Aerate this week too. I just felt better when I would core Aerate. ;)

Could be fungus? Definitely need close up of blade

I don't think its a fungus personally, should I put something down incase? won't hurt will it

No, don't put anything down right now. Fungicides affect beneficial fungi as well, you don't want to do that unless you have to. Post the pictures and we'll figure out what it is.

Ok I just went out there it Poured all morning, I took close ups as close as I could get

What makes you think those brown & gray lesions aren't fungal?

Looks fungal but I don't know exactly what it is, my familiarity with KBG is limited.

Where is Morph? He usually Helps me Out

The last two pictures do show brown areas on a number of blades. A lot of the blades are discolored at the tips, others are discolored lengthwise, and other blades have spots.

The most yellow grasses are diseased. Whether it is fungal, bacterial, or viral, I can't tell. Look for a lawn fungicide for the type of grass you are growing. That can eliminate one of the three. You can test if it's truly fungal, bacterial, or viral by mowing those yellow spots and checking to see if more appear via lawn mower spreading. If the spots get bigger or more appear, that will tell you the basic issue. If it stays the same then try fertilizer if you haven't recently. If you just fertilized it could be too much. And if you exhausted that list then it is grubs

I Fertilized it today James, w a winterguard turfbuilder, my lawn is in really good condition, I am planning to Aerate soon Also, ;) Thanks

grubs? I Treat for Grubs every spring Fyi, and tried tugging on the grass and it don't come up

You obviously haven't done the dance & chant to conjure the man yet.

I'd get a bag of Headway G on that yesterday.

OK, let me try again.

If I were in your situation, I would apply Syngenta's Headway G granular fungicide to the entire lawn immediately. It can be obtained at your local SiteOne or other landscape supply store, but not at big box stores. It is very expensive to purchase online. If Headway G cannot be obtained, Heritage G along with Bayer Fungus Control would be an acceptable substitute.

Because the rest of us know what fungus looks like & we're trying to assist. We wouldn't just tell you to use fungicide without a reason, your pics show symptoms we see regularly on fungal outbreaks. That doesn't mean we're 100% right, but generally the simplest explanation is the best bet. Why are you so sure it is not fungal?

It's been like that for a few months so it tells me its NOT fungal.

Sorry, didn't mean to imply attitude, just confidence in my answer.

Well that escalated quickly...

At the end of the day its a forum for advice. Some may suit your needs, others not as much. This forum has been extremely helpful for me.

I apologized for my brusque typing skills & wish you best of luck. I sincerely hope you find your answers here.

I was going to say that it was classic fungal disease, as in poster child for lawn fungal diseases, but I don't want to get my head bitten off. Distinguishing a fungal disease from healthy grass is about all we can do here. I can tell you it isn't red thread or rust, but the grass is clearly rotting and turning yellow and brown at the tips. If I was to go crazy with my suggestions I would suggest that the grass experienced some days of flooding this summer or possibly even daily watering.

Treating for grubs in the spring is a waste of money. The beetles that lay the eggs are not even flying around until late May or early June. I would not recommend treating for them at all unless/until you have dug up at least 1 square foot of soil and found lots more than a dozen grubs.

dchall_san_antonio so You would put a fungicide down? like Bayer? I just fertilzed today though

It's not grubs, it is definitely a disease. I'm not much at guessing and it doesn't matter. Get a fungicide with the widest spectrum: patch diseases, spot diseases and Pythium. Use it now and again next year.

See this for chemical name, Brand and effectiveness against named diseases. You'll need to check the AI of Bayer or Spectracide etc. and find it on the above link to see what it may help with.

Thank you Yardtractor1, it's not bad looking like most lawn diseases which made me think its just lack of some Nutrient....like Iron or Nitrogen

I was going to use Bayer fungicide control, used Bayer for Grubs before, and I also fertilized today is it ok to put something down?

The leaf lesions and that leaf color isn't indicative of a nutrient deficiency. No problem with using a fungicide despite fertilizing.

It looks like there are some holes in the lawn. Yes?

You don't think its Thatch? I mean to me it looks like Thatch when I am up close on it outside...ugh this is so frustrating to me

No hole in the lawn anywhere

It's a sod lawn so Its super thick, and It poured this am so that is what you're seeing...I walked on it and made tracks

Have you had a soil test? That would exclude or identify any nutrient deficiencies and give you a baseline for the future? Some deficiencies can cause leaf symptoms with die-off and color changes, but seldom are they so spotty over that size area. The lesions almost always mean disease.

Thanks so much, I think I am just going to do a soil test like you mentioned, when I think fungus I think like summer patch etc. that Look awful and this don't look bad I am just super anal w my lawn, its a little lighter green to the eye if you go right up on it close like the pic then you can see the brown but the whole lawn has a lot of thatch to be honest, its sod, sod always does.....

One of the biggest evils of thatch is disease.

which leads me to, the dreaded ? in here Lol I have Aerated since I sodded back in 2009 and my lawn has been perfect ...its been 2 yrs and I haven't and I feel this is why this is all happening...

Most here know my position on aeration. I try not to speak of it.

Do you think I should Aerate now? You don't have to talk about how you feel Lol I just so badly want to Aerate this week or next but if you think its a fungus? idk, Treat it and Aerate?

Thank you, you've been very kind ;) and helpful ...I will give an update soon!

N.P., anytime. The others aren't chopped liver. :) Some of them know a lot about fungicide treatments and which chemicals to use. Some know a ton about warm season grasses or fescues. Don't sell them short. :)

I'm not, I always liked coming here for help on grass as you can see in my old posts, but I was upset today and it rubbed me wrong, I take my lawn serious, too serious at times

Nothing wrong with fungicide + fertilizer. When you get sick you don't stop eating food. You might not have a big appetite, but you still need to eat. Plants are the same. Keeping proper nutrients available will help the grass get through whatever the issue... assuming it does not have too much fertilizer already.

I fertilized today w winterguard, last time was spring, I don't like to Use fertilzer often to keep summer patch at bay, that is what happened to my lawn before I sodded or chinch bugs it was so bad, so I mow High, don't use fertilzer past june and Aerate since 2008 and the last 2 yrs haven't Aerated and def feel this is part of the current problem, going to Aerate this week ;) Thank you James

I get the distinct feeling yardtractor1 has been married a long time. Well done, I have taken notes :-)

You asked if I would use a fungicide like Bayer. Well, sort of. I would use an organic approach to killing fungus. Corn meal is my go-to organic fungus treatment. It has worked for me every year I've used it since 2002.

I put down Bayer advanced fungus control this afternoon and watered it in good, now I sit and see!

I get the distinct feeling yardtractor1 has been married a long time.

Interesting observation j4c11.