I would beleive anybody maintaining a residential lawn using a sound agronomy program, their would only be a rare need for a turf fungicide
In 20 yrs on Gc, I don't believe I ever applyed a fungicide to the fairways, and only a few times to the tees!
Timothy J Murphy Specializing in Quality Turf
Bs in Plant and Soil Science
Almost 40 yrs exp., 20 as GC superintendent
Primarly work with cool season turf