Thank you for the information. I will check for grubs.  I did have my lawn fertilized last fall. Would it be possible that the grass could have been burned by the fertilizer?  I know it’s hard to see in the pictures but the grass is more yellow than brown in many of the areas.  I haven’t done the fertilizing in a while and this is the first time I am seeing these spots in my grass.  Nancy

Hi Steve, I checked my grass both the green grass next to the dead grass and also the dead grass itself. I did not find any grubs. I checked through the top soil. None of my neighbors is having this problem. This is the first year we have ever seen this. I know I had a lot of crab grass last year. So that is my next question. Should I put crab grass preventer down and then wait until fall to seed? Or should I seed now and do I have to take the dead grass out and put new dirt down? I have a very large yard with many of these dead spots or brown spots. Thanks in advance for helping me figure this out. Nancy

Hi Steve, I am not sure if my email went through or not. I do have ants. I am not sure what kind but they look more like the cornfield ants but then again the damage to the grass seems more like the funnel ants. Anyway, should I treat the grass now with grab grass preventer and the ant insecticide or should I plant new grass first. Please let me know what you think. I will try to upload 2 pictures. It won't let me. Thanks for your help. Nancy