What I thought were indicator spots in previous years (primarily due to shallower soil) started showing stress several weeks ago. I applied compost/coffee grounds, shampoo, and some compost tea. Some of these spots bounced back or experienced new growth. But the brown areas are expanding and showing up in areas that I previously have not experienced problems. Screwdriver goes in easily in some areas, and with difficulty in others. I did the paper check for cinch bugs but did not see anything. I treated for grubs in the spring with nematodes (while I've seen a few around, I've never found a substantial amount when digging - I have not checked so this summer). I have brought my HOC up to 1.5" for the summer, and mow about twice a week, alternating between a reel and rotary. Two-thirds rule is violated occasionally, but not usually.
Area that is beginning to brown:
New area with two of four largest areas of collapse in background:
Close-up of above - Cheap moisture meter showing decent moisture at 2" in (and it's wetter at 4"):
Blade closeup from above:
A few more close-ups in following post.
What next? I prefer organics, but fear that this is going to be a widespread problem. I appreciate the advice and wisdom.
