When to apply fungicide

Warm season grasses like Bermuda, Zoysia, St. Augustine, Centipede & Paspalum
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Southern Lawn
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When to apply fungicide

Post by Southern Lawn »

Afternoon. I laid Zeon zoysia back in November. The last several days have been really wet and /I am concerned about fungus in the new turf. I realize that it roots slowly this time of year, but when is it possible to apply something. I do not want to apply fungicide to early and damage the turf.

Thanks

corneliani
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Re: When to apply fungicide

Post by corneliani »

Generally fungicides ideally get applied in the fall, as temps start cooling down (think mid-late Sept, into Oct). For spring disease suppression you can apply as the turf starts growing (March into April). This allows for the plant to absorb the chemical and protect itself from the aggressive rhizoctonia fungi. If you suspect you have fungus try to keep nitrogen off of it until the diseases pressure passes, typically into May. I'm using Atlanta weather but that should match up with yours pretty well I think.

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CenlaLowell
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Re: When to apply fungicide

Post by CenlaLowell »

corneliani wrote:
Wed Jan 15, 2020 3:09 pm
Generally fungicides ideally get applied in the fall, as temps start cooling down (think mid-late Sept, into Oct). For spring disease suppression you can apply as the turf starts growing (March into April). This allows for the plant to absorb the chemical and protect itself from the aggressive rhizoctonia fungi. If you suspect you have fungus try to keep nitrogen off of it until the diseases pressure passes, typically into May. I'm using Atlanta weather but that should match up with yours pretty well I think.
For me it's April to September. St Augustine is horrible with fungus problems
Killing two birds with one stone is the name of the game. :bandit:

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Rammy1546
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Re: When to apply fungicide

Post by Rammy1546 »

@CenlaLowell It’s horrible. Especially in shade. I feel like st augustine never ever looks great because it’s always has a tan tint to it from fungus, too much water, not enough water, chinch bugs, etc...!
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CenlaLowell
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Re: When to apply fungicide

Post by CenlaLowell »

Rammy1546 wrote:
Wed Jan 15, 2020 8:49 pm
@CenlaLowell It’s horrible. Especially in shade. I feel like st augustine never ever looks great because it’s always has a tan tint to it from fungus, too much water, not enough water, chinch bugs, etc...!
Every year I will have a fungus problem if I didn't spray. Azoxystrobin, Propiconazole are life savers.
Killing two birds with one stone is the name of the game. :bandit:

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Re: When to apply fungicide

Post by sabanist »

I just got some Propiconozole today. I show signs of brown patch in an area of my front yard. So should I NOT treat til spring, or go ahead an apply the curative rate?

corneliani
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Re: When to apply fungicide

Post by corneliani »

Turf-affecting fungus usually occurs in hot/humid (wet) weather, when nighttime temps are in the 60's and above. That describes our past couple weeks, but going forward it looks to be cooling down significantly meaning no disease pressure. Fungicide is 'forward-looking' in that regard.. it needs to be applied in anticipation of disease-pressure situations.

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