I will admit I really dont know much about fungicides. I have seen what I presume is rust, brown spot and probably some more over the years. I havent seen any yet this year, but have seen some patches that im going to assume is something. What is a good overal fungicide you guys use? Money is a factor as I have close to an acre.
There really is no "good overall" fungicide and unfortunately, if money is a factor, forget about a fungicide program. Standard advice would be a DMI / strobin tank mix or sequential applications of each. Rotate groups throughout the season. Apps are every 28 days.
A program might go something like this:
28 day rate of propiconizole & azoxystrobin tank mix April 1, 28 days later, 28 days later.
28 day rate of thiophonate-methyl & fludioxonil or flutolanil tank mix 28 days later.
28 day rate of propiconizole & azoxystrobin tank mox 28 days later, 28 days later.
Another approach is the "Program 11" where you watch and chart weather patterns and apply an appropriate app to prevent the specific diseases becoming high risk at that time. If you're not doing this as a full time job, that can quickly become a handful.
You can certainly try a quick fix or rescue app for a devloping problem and in such cases identification is critical but at the end of the day, an expensive, labor intensive program with no guarantee of complete success is still the only way to really give a fight against fungus. You can go with a single app for a rescue of one problem only to have another problem crop up. It basically is sort of all in or not at all.
If you don't rotate groups properly you risk selecting out the resistant fungus which now has no competition because you killed everything else. Yes, that is what we call "bad."
Do your best with solid cultural practices and if fungus is still a problem, you have to make that call on whether fungicide apps are really for you.