Expanding fungus patches

Warm season grasses like Bermuda, Zoysia, St. Augustine, Centipede & Paspalum
Post Reply
Topic Author
SGK
Posts: 13
Joined: Sun May 20, 2018 1:56 pm
Location: Miami
Grass Type: St Augustine (Palmetto)
Lawn Size: 0.5 acre
Mower: Toro

Expanding fungus patches

Post by SGK »

Hi. What do you guys use to treat fungus in lawns? (And for that matter, hedges)

ionicatoms
Posts: 1702
Joined: Sat Mar 07, 2020 6:38 pm
Location: North Florida
Grass Type: St. Augustine (Palmetto)
Lawn Size: 7100 sq. ft.
Mower: Toro 21386

Re: Expanding fungus patches

Post 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
Want to know more? Review my Lawn Journal

Topic Author
SGK
Posts: 13
Joined: Sun May 20, 2018 1:56 pm
Location: Miami
Grass Type: St Augustine (Palmetto)
Lawn Size: 0.5 acre
Mower: Toro

Re: Expanding fungus patches

Post 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.

ionicatoms
Posts: 1702
Joined: Sat Mar 07, 2020 6:38 pm
Location: North Florida
Grass Type: St. Augustine (Palmetto)
Lawn Size: 7100 sq. ft.
Mower: Toro 21386

Re: Expanding fungus patches

Post 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.
Want to know more? Review my Lawn Journal

Topic Author
SGK
Posts: 13
Joined: Sun May 20, 2018 1:56 pm
Location: Miami
Grass Type: St Augustine (Palmetto)
Lawn Size: 0.5 acre
Mower: Toro

Re: Expanding fungus patches

Post by SGK »

Thanks. I will try Propiconazole first.

I took a pic of the hedge fungus.
Image

ionicatoms
Posts: 1702
Joined: Sat Mar 07, 2020 6:38 pm
Location: North Florida
Grass Type: St. Augustine (Palmetto)
Lawn Size: 7100 sq. ft.
Mower: Toro 21386

Re: Expanding fungus patches

Post by ionicatoms »

If you scrape it with your fingernail, is there healthy tissue underneath it?
Want to know more? Review my Lawn Journal

Topic Author
SGK
Posts: 13
Joined: Sun May 20, 2018 1:56 pm
Location: Miami
Grass Type: St Augustine (Palmetto)
Lawn Size: 0.5 acre
Mower: Toro

Re: Expanding fungus patches

Post by SGK »

Yes!

ionicatoms
Posts: 1702
Joined: Sat Mar 07, 2020 6:38 pm
Location: North Florida
Grass Type: St. Augustine (Palmetto)
Lawn Size: 7100 sq. ft.
Mower: Toro 21386

Re: Expanding fungus patches

Post by ionicatoms »

Want to know more? Review my Lawn Journal

Topic Author
SGK
Posts: 13
Joined: Sun May 20, 2018 1:56 pm
Location: Miami
Grass Type: St Augustine (Palmetto)
Lawn Size: 0.5 acre
Mower: Toro

Re: Expanding fungus patches

Post by SGK »

Thanks. Got it. So I need an insecticidal soap

DIY Lawn and Garden Products
Post Reply