[RickFLM4]

I would not add fertilizer to a lawn showing signs of fungus / disease. You can pick up some fungus or disease control granules at Home Depot and give them a try.

I’m not that familiar with Bermuda, but have seen the 2 yards in my neighborhood who switched to it have similar issues as you describe. Try looking online at the University of Florida's Institute of Food and Agricultural Sciences (IFAS) for articles about how to best care for Bermuda and address the problem you have.

For reference, I try to water once / week at most (and sometime none) during rainy season, once or twice when it is dry and mild and no more than 3x if we hit a patch where it is hot but not raining. 2 pins (I think 24 minutes) per zone.