Large Patch - St Aug

Large Patch. Being in New Orleans it’s not likely your St Aug has gone
dormant yet so I’d suggest you treat it with either azoxystrobin (Scott’s Disease X) or propiconazole (different brands sold by most retail garden centers) - both are systemic fungicides. You could re-apply in 6 weeks if the grass is not dormant - being in NOLA it might not be but I think it most likely would at that point. And then proactively follow up again next spring when conditions are favorable for Large Patch. Hopefully ronk will see your post and respond - he’s very knowledgeable on lawn diseases.

Also consider following up with your parish LSU Ag Center extension agent for advice for your location - just send them an email. LINK

Yeah that looks like Large Patch. It’s been real prevalent this fall, couple neighbors with St Aug have it, I have a small spot or 2 in my centipede front lawn.

It does have a tendency to re-appear annually in same locations so if you’ll note where it’s occurring now, proactively treat those areas with fungicide when conditions are favorable for its occurrence you can get on top of it. Lawns as a general rule recover fine from it.

Now Take All Patch is the really bad one that can take out a lawn.

If you have St Augustine, a fungicide program is a must. More so than other grasses although they all can use them.

I have zoysia and have gotten patch from time to time.

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have liquid systemic fungicide on hand. Can I spray that after this thunderstorm? Then put Disease X out in 4-6 weeks?

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If the spray fungicide is one of the those in the AgCenter Large Patch article linked above, which it most likely is, sure. Now if your Zoysia is dormant in 4 to 6 weeks, I’m not sure the Disease X would be effective as it is a systemic fungicide and it’s not likely to be uptaken by the grass, and the Large Patch would not likely be active that point anyway, so you’d want to focus on the spring when large patch fungus becomes active again. And I’ll emphasize what gamecocks stated - it is preferable to rotate fungicides with each application to mitigate the possibility of developing resistance by the fungus pathogen.

That’s my thought anyway - gamecocks22 and ronk, who are lawn and weed control professionals, might have another opinion on this and if so follow their advice - I would.

Agreed thanks everyone for the input, helpful as always

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Get on a rotation of putting out fungicides 2x a year.. fall and spring.

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My rotation is fungicide every 3-4 weeks during the growing season