Headway G asap. I believe SiteOne (formerly JDL) has it.

Thanks J4c11. I've read that Headway G is primarily used as a preventative fungicide, and holy cow is it expensive!!! $$$

Will this make much of a difference on a lawn that already has it? I'd hate to spend a lot of money if it's not going to make much of an impact at this time of the year.

Also, I'm concerned about applying this on our lawn, as we are on a well and not city water/sewage.

EPA Advisory for Headway G

Headway G can be used as a preventative, and since it's easier to stay out of trouble than to get out of trouble that's the best way to use it. That train has left the station. It is also one of the best curative products out there for brown patch. Azoxystrobin is a contact kill fungicide while propiconazole acts a little more slower by messing with the cell walls of the fungus. Both will penetrate grass blades and protect the grass from the inside. It's really not that expensive, Southern States has it for $60, SiteOne probably about the same. Online it's $100 almost everywhere. It is the Rolls-Royce of fungus control for lawns.

Propiconazole can be bought by itself as Bayer Fungus Control or online under different brand names, you can spray with a pump sprayer. It's not as effective by itself, but it may get your lawn through the summer and it's less expensive.

I can understand your concern in regards to Headway G, especially if your water table is shallow. Many pesticides and fertilizers will leach. That's your call.

Seeding again in the fall is an option.

I had a vicious problem with brown patch. Applied propaconozol with pump up sprayer 3 weeks later lawn has recovered and is greening up nicely.

Thanks J4c11! I did end up calling Syngenta's customer service number, but the guy I spoke to didn't seem to be very well informed about using this stuff around a well. He basically told me I'd "have to pour it down my well" to do any harm, but I'm I'm not taking his word for it. :-)

He did say that since it is a preventative, it isn't going to be as effective during an active outbreak, especially at the end of summer. He told me to definitely put this down in the fall and spring with my regular seasonal maintenance.

Southern States has it for $58.00 on their website and there is a store near me, so I think I'm going to put some down anyway and go at this again in the fall and spring.

BTW, this is my BACK yard....eeep! $$$$

My lawn alone is almost 2 acres. We were JUST at the point of feeling like we had this looking really good. When we bought our house 3 years ago, this property was abandoned and the back yard was so bad, we had to hire a bushhogger to come in and clear it.

You can always spot spray these trouble areas with propaconozol especially if most call for 1 oz per 1000 sq ft. (835 ounces or so which is a lot!) granular by spreader may be better to pre treat.

Yeah treating that large an area is going to be expensive.