I'd also advise that fertilizing every 2 weeks is asking for big
trouble. * Excessive nitrogen, lots of water and high temps are a
prescription for fungus and disease. * Golf courses do use a lot more
fertilizer than the typical home lawn and apply it in varying weather
conditions due to their special requirements. * *But to go along with
it, they also use a ton of chemicals to ward of fungus, either pre-
emptively or at the first sign of trouble

I also applied supplemented with Ironite. I'm doing this to get deep
roots. My lawn looked dead prior to this. My bro in law's advice was
to basically get the lawn strong and slowly back off of the excessive
fertilization and watering schedule.