If I had more time to research I wouldn't waste your time asking about this. The grass is pretty high at nearly 4.5". I suggested I mow short & bag it all up before doing anything. Only thing his spray guy suggest is giving it another couple weeks before he sprays weed app. I'm in Central Florida if that helps. Much of the lawn looks great but then these big spots look terrible. Almost like someone dumped round-up. Thanks to all!