Lime green on my St. Augustine lawn usually means new growth. When it starts to turn yellow to brown is when I start to worry. I do have one circle that has started so I'm worried it is "brown patch." This usually only happens with moist conditions and cool temps.
that describes my issue perfectly
what do you do?
Corn meal. Your symptoms could be and most likely are Gray Leaf Spot or maybe Take All.
Not sure what fertilizer you're using, but you say it has plenty of water and fertilizer. That's a hot bed for fungal disease in most if not all St. Aug grass. Fast release nitrogen is the worst which is what most common fertilizers have a lot of.
Trying to keep it simple, corn meal triggers/benefits the good fungus and they will attack the bad fungus. I don't typically have any fungal issues in summer do to lack of rain and prior apps. Though when do get good rains like your area has had I'd lay an app down. It's cheap.
Most feed stores have it or can get it. Whole Ground CM should be about $6-8ish a 50lb. It's a little dusty but spreads pretty easily through a spreader. 20lbs per 1000sq feet. Doesn't have to be watered in. Do it monthly for the first few months. It takes time. You wouldn't start seeing results for 3 or so weeks. But with fall rains coming along, I'd start laying it down.
That's my non chemical approach. Which most chemicals that would actually work you'd have to have a license for and not OTC.
