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
Sounds like Large Patch disease; see details on it here: https://www.apsnet.org/edcenter/disandpath/fungalbasidio/pdlessons/Pages/Rhizoctonia.aspx and https://www.turffiles.ncsu.edu/diseases-in-turf/large-patch-in-turf/
SGK said:
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.
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.
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