This is the pink snow mold version of the disease. It's very common in the pacific northwest this time of year. Pink snow mold does not require snow cover to flourish.
With the exception of Daconil, there are no curative fungicides. He’s already run the best fungicide on the market and actually it doesn’t look “active”. I agree with @hedgehog_MI , looks like possibly dollar spot. Hit it with some N @ maybe .25 lb and see if it doesn’t grow out.
Using the true meaning of the the word cure, no fungicide will do this, according to some plant pathologists. However, several fungicides are marketed as both being preventative and curative, including Daconil.
Except that OP said he/she/they have already put down two applications of fungicide. So that tells me that if given a couple weeks between apps and the initial growth of the disease (before notice) — the disease could have originated well back close to summer or early fall.
If that's the case, the environmental conditions that lead to the disease are probably long gone and there is nothing to do now except to repair the damage if needed.
Yes, and to your point — to take a proactive approach to the problem by treating it as others have suggested with cultural control methods, and possibly with a preventative fungicidal program, after a positive identification of the disease.
Not to make an argument here, but , 2 of the most popular fungicides , Myclobutanil and Propiconazole both say to mix with Daconil. “Curative “ is a subjective term with fungicides.
A disease application is not going to fix the damaged turf. What is damaged is damaged. The fungicide will stop the spread. Also checking the soil ph would help. Getting a soil test.
