I have recently started noticing dead spots on my grass which I first thought might be fairy rings.

The spots are about 2-3 inches in diameter and they look like they have fine wispy cob webs on them. Maybe a fine mold?

The spots are multiplying but not connecting. And they are only on one third of my lawn, from the flower bed down to the sidewalk.

Facing full south, with a lot of high heat and humidity(like the rest of the northeast this summer), we have watered in the afternoon, and the dew has been quite heavy in the morning.

We have worked like mad men over the last 3 years to get this lawn back from the 40' high pine tree that we removed, and then had to dig out all the roots from that and the city street that was taken down.

Somebody please help.