So couple of dumb questions. I think I'm going to aerate, dethatch and put down some Scotts disease ex - only need to put it on the affected areas correct, not the whole lawn? Also, I looked and prices really aren't horrible for the sod as you mentioned. If I decide to replace some of the affected areas with sod, should I treat before or after I put the sod down or is it even necessary to treat if I go the route of tearing up and placing sod?Couple things about this the fungus lives in the soil so even if you rip out a half inch it still might be in the profile below that and it still may be present other areas in the lawn so it can easily be brought back into that area. I hate to sound like a salesman for the local sod farms but honestly if you go the removal and replace route you might want to look into a sod. When you look at drought and disease resistance natural centipede and bermuda are the worst, seed is in the middle, sod is the best. You can probably get 10 rolls of tifblair centipede from super sod for less than $100 to cover your issues. If I could do it all over again I would sod my yard vs seed I would also probably go with zoysia over bermuda/centipede