Is this like a shoulda woulda type deal with this fungus? I was planning to use baytelon earlier but waited. Now its all over... most other laws look worse if they do have it... If treated now will the systemic fungicide work in time to kill the fungus? Would a preventative approach be a better means of control?
I've seen some pretty rough looking lawns recover completely from dollar spot with just a good shot of nitrogen and the right conditions to grow the fungus out. It will go away on it's own when the weather changes. Or, you can do like TGCL and some others and spray some expensive fungicides and proclaim yourself a hero when it goes away (which it will do anyway).
T-Surf offers some great advice on control. If you do decide to use fungicides I would recommend spraying, better control. Use products like Eagle, Spectator and Compass to name a few. If on commercial property you can add Chlorothalanil(?). Left unattended in severe cases you could see some truf decline.
