I have a problem with a fungus and hope theres someone out there that has had a similar experience and can help out. I have a fungus known as Pythium Blight in a tall fescue lawn with clay soil. I cut down the water to three times a week even during the hot 100 degree whether we have been having. Ive had the fungus sprayed with a fungicide and none of these things seem to be helping any. In the spring I aerated and topdressed lawn to improve drainage and added gypsum during the summer(no help). The last time I fertilized is in May when temperatures were lower. Ive called the local ag department and they told me to cut water down to three or days aweek and water once a day not more than a minute or two before noon to help cool of the blades during these hot summer months. Still no help. The wether has changed to the upper eighties and lower nineties which I know this will suppress it a little but I need your help before I lose the whole 1400 sqft of grass.