Just to add to everyones woes, I planted farm store blue cert bags of Kentucky 31 in Early October....the lawn was AWESOME, regular feedings, knocked out a fungus spread following some rec'd steps here, and pretty much the whole front lawn died as soon as we started having 100+ deg. days....no amount of watering seemed to keep it at bay....maybe my house is directly under a hole in the Ozone? It kills me when I think about the cost of seed, water, feedings, lime, grub killer, etc etc etc...
I am DONE, I got the basics of how to have a great lawn by spring, when I am ready to sell the house, we will be sure to run the thatcher and seed-slitter in fall, and sell in the spring.
I am going back to letting whatever grows....grow, cut it short often so it all looks green and go on about my life!