Thank you for your response. You may be correct, however, I failed to mention that my entire lawn has displayed this look all season, and my neighbors' lawns similarly cared for don't seem to exhibit this issue. In the picture below you're looking down the property line with one of my neighbors. My ...

In SW Ohio we went from 85-90 degree highs to 65-73 degree highs the past couple of days. So I'm lowering from 3.75" to 3 this week. My last couple of leaf mulching cuts in a few weeks will be 2.5" or less, using 2 passes each cut.

https://i.postimg.cc/k6vd8fQt/20191006-171705.jpg Can any one suggest why I have so many brown blades in my otherwise apparently healthy lawn? The problem isn't brown patches, just brown blades dispersed evenly across the lawn just enough to be noticeable. This is in SW Ohio, and the grass has been...