Help ID'ng Disease or Fungus

[Oldschool]

Hey Group...

I was hoping someone would be able to assist in identifying a disease or fungus that has begun to rear its ugly head.

I have a 100% KBG lawn. Yellow spots began appearing 2 weeks ago. I now have approximately a dozen areas some two feet in diameter.

I can take better pics if need be.

Thanks

[HoosierLawnGnome]

Have you been irrigating it? Could be going dormant if not. I don't see a ton of lesions - mostly yellowing blades and you're describing expanding spots. So, if it's not normal drought stress - dig up a particularly yellow spot and look for a sludge on the roots. That could indicate summer patch.

[Oldschool]

Thanks HLG...I am irrigating so I'll gett the shovel and see what I find.

[Oldschool]

I dug underneath 3 of the yellow patches and found nothing out of the ordinary. Soil was dry which surprised me since I irrigate. Anyway, I took a couple more pics.

[HoosierLawnGnome]

I would irrigate and see how it does. Maybe localized dry spots etc.

A few of my heads went bad and were only spraying a narrow band. I've been irrigating a lot more as a result and adjusting spray patterns.

[Oldschool]

I spot watered a few patches this morning to see if it was what you said, trying to go dormant. I'll check my heads tomorrow to ensure good coverage.

Thanks HLG,