Q.Yellow St Augustine Grass In Dallas TX
The grass is well established and has never done this before. I put down weed and feed in April then added Milorganite in May. Did I over fertilize?
Certified GKH Gardening Expert
Unfortunately, your photo did not come through. If your soil test revealed deficiencies, and you followed all packaging instructions than it is not likely overfeeding.
As it starts to warm up, Many tend to water their grass a little more than necessary in attempt to offset heat. This can lead to rot. The particular pest shows itself, quite suddenly, when warm temperatures come around.
Here are some articles that will explain what it is and what to do:
https://www.gardeningknowhow.com/lawn-care/lgen/treating-lawn-diseases.htm
https://www.gardeningknowhow.com/lawn-care/lgen/fixing-an-overwatered-lawn.htm