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Expanding fungus patches

Posted: Fri Jan 14, 2022 12:44 pm
by SGK
Hi. What do you guys use to treat fungus in lawns? (And for that matter, hedges)

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 12:59 pm
by ionicatoms
Depends on the fungus/site. Labels and University research are useful for this; particularly NCSU. Liquids are best for stopping an outbreak. If you go granular, it has to be watered in.

I use a rotation or sometimes a combination of the following active ingredients:
Propiconazole (Group 3)
Azoxystrobin (Group 11), aka Abound or DiseaseEx
Thiophanate-Methyl (Group 1), aka Clearys 3336

Contact/surface:
Chlorothalonil, aka Daconil

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 1:47 pm
by SGK
Hi. Thanks

What I am seeing on my lawn is large patches, roughly circular, slowly turning brown and the size of the patches increasing. Brown patch?

On a hedge around my AC units I have some sort of black fungus.

I'm hoping I can use a sprayer on both.

I found Propiconazole.

https://www.amazon.com/Propiconazole-83 ... 136&sr=8-4

Maybe I need to mix in Azoxystrobin as well??

I see DiseaseEx but liquid forms, eg Abound or Azoxy 2SC Select, seem VERY expensive.

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 2:13 pm
by ionicatoms
SGK wrote:
Fri Jan 14, 2022 1:47 pm
What I am seeing on my lawn is large patches, roughly circular, slowly turning brown and the size of the patches increasing. Brown patch?
Sounds like Large Patch disease; see details on it here: https://www.apsnet.org/edcenter/disandp ... tonia.aspx and https://www.turffiles.ncsu.edu/diseases ... h-in-turf/

SGK wrote:
Fri Jan 14, 2022 1:47 pm
On a hedge around my AC units I have some sort of black fungus.
Not sure what that might be. You might be able to hit it with a combination of Propiconazole and Daconil; labels will typically list compatible species.

SGK wrote:
Fri Jan 14, 2022 1:47 pm
I found Propiconazole.

https://www.amazon.com/Propiconazole-83 ... 136&sr=8-4

Maybe I need to mix in Azoxystrobin as well??

I see DiseaseEx but liquid forms, eg Abound or Azoxy 2SC Select, seem VERY expensive.
I don't think you NEED to mix in Azoxystrobin for the first 2 or 3 applications of propiconazole. However, you can't expect to apply the same fungicide mode of action over and over again without creating a resistant fungus. So, rotation is needed in the long term. Azoxystrobin is relatively expensive, but the cost can be managed by looking for a split in the TLF Marketplace. Obviously not a great solution when you are looking for a product NOW, but might be to your advantage to get some when a split comes up so that you have more than one mode of action available. Once you have a fungus in your lawn, you can expect it to be a recurring problem when the conditions for an outbreak are met. Ideally, you are getting down fungicide before the weather changes in the fall.

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 3:18 pm
by SGK
Thanks. I will try Propiconazole first.

I took a pic of the hedge fungus.
Image

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 3:37 pm
by ionicatoms
If you scrape it with your fingernail, is there healthy tissue underneath it?

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 4:33 pm
by SGK
Yes!

Re: Expanding fungus patches

Posted: Fri Jan 14, 2022 5:11 pm
by ionicatoms

Re: Expanding fungus patches

Posted: Sat Jan 15, 2022 8:59 am
by SGK
Thanks. Got it. So I need an insecticidal soap