Sorry, uploaded 4 different images but only 3 showed up all the same, which was what it looked like the day after delivered. I'll try to upload images of what the grass looks like today.

Are you in Mobile or further inland?

Mobile. Weird that some squares are great, some are half good and others are totally bad looking.

Chances are good that this is a root rot and not another disease or a drying situation. It seems to be going around with new sod in your area and to the southeast. If you have already applied a fungicide, then just sit back and see how it works. Give it 3 weeks.

How are you watering the new sod when it isn't raining?

"isn't raining" is very rare here but it didn't rain Wednesday and only a sprinkle yesterday.

Just applied another round of fungicide as I've now determined it's leaf spots. Can only hope it'll recover in 3 weeks.

After looking at video of sod the day after it was delivered, I have little doubt this was a bad batch of sod. It was yellow and fell apart as we picked it up off the pallet. We never should have accepted delivery and I questioned it enough to make a video but waste of time going back to the sod company 2 weeks later; will just buy from another supplier next time.

You've named the brand of your fungicide & fertilizer, but do you know if you purchased a branded st. Aug sod? Is it palmetto or sapphire or Raleigh or any other named cultivar from a certified supplier? If not, your next order probably should be...

It's called "classic". Supplier says it's the best St. Augustine on the market.

Some of those spots remind me of Septoria.

From what I found on Google, classic is a fairly new variety but hasn't shown much improvement except in color. Apparently it has a really dark color, but same disease tolerance as the unimproved genetic varieties

Thanks guys, decided I'm going to dig up a section of grass and take it to the supplier. They are the largest sod supplier in the area and have numerous sod farms in the South so they should know what the problem is.

If you ever stop spraying fungicide for a month or so, try using a little compost and ordinary ground corn. You can get corn meal at your local feed store. I used corn meal successfully for 14 years on leaf spot type disease in St Augustine. The application rate for compost is less than 1 cubic yard per 1,000 square feet. The app rate for corn meal is 20 pounds per 1,000 square feet. If you cannot find corn meal, you can use cracked corn or corn flour from a grocery store that caters to Hispanic cooking. It comes in 25 pound bags at the grocery store.

Dchall thank you for that, my back went into spasms just thinking about compost cubic yardage for my front yard.