Best Fungicide For St Augustine Grass of 2024: Top 6 Picks

By Harry RamosLast update: 2024-04-17

Are you tired of dealing with pesky fungal diseases ruining your St Augustine grass? Well, the good news is that you don't have to suffer through it any longer!

With various fungicide options available on the market, protecting and maintaining a lush green lawn has become much easier. In this blog post, we'll be discussing the best fungicide for St Augustine grass and how they can help keep those unsightly brown patches at bay.

So let's dive in and learn more about these amazing products that will bring life back into your lawn!

Here are the best fungicides for st augustine grass you can buy in 2024:

  • Fast Acting (Systemic Fungicide): Scotts VB02423
  • Best For Red Thread Control (Systemic Fungicide): BioAdvanced 701230A
  • Best For Dollar Spot Control (Systemic Fungicide): Bonide BND60514
  • Less Odor (Systemic Fungicide): Propiconazole 83013365
  • Best For Long-Lasting Disease Control (Contact Fungicide): Bonide 811
  • Best For Rust Control (Contact Fungicide): Southern Ag 029030
6 Best Fungicides For St Augustine Grass
Fast Acting
Scotts VB02423
  • Systemic Fungicide
Best For Red Thread Control
BioAdvanced 701230A
  • Systemic Fungicide
Best For Dollar Spot Control
Bonide BND60514
  • Systemic Fungicide
Less Odor
Propiconazole 83013365
  • Systemic Fungicide
Best For Long-Lasting Disease Control
Bonide 811
  • Contact Fungicide
Best For Rust Control
Southern Ag 029030
  • Contact Fungicide

Fast Acting: Scotts VB02423

Scotts VB02423
Scotts VB02423
Pros
  • No need to wait for results – fast-acting formula
  • Both effectively curative and preventative from fungi-related diseases - Azoxystrobin at 00.31%
Cons
  • You need to use it consistently and regularly, making it pricey

For those who want to give their lawn a quick and easy disease treatment, we recommend the Scotts VB02423.

It contains the active ingredient Azoxystrobin at 00.31%, known to be both effectively curative and preventative. More specifically, this ingredient can treat and prevent fungi-related diseases, such as brown patches and gray leaf spots, helping to protect lawns from disease.

And you can apply the fungicide to a lawn before any sign of disease appears, as well as after established lawns have already been affected by the disease. This can help reduce the amount of damage that can be caused by fungus on St Augustine grass.

The product is also available in different sizes—up to 5000 sq. ft., making it easy to apply the product to large areas without having to purchase multiple packages.

Scotts VB02423 Specifications

Form

Patches

Volume

10 Pounds

Active Ingredients

Azoxystrobin - 00.31%

Highlight Features

fast-acting formula

Azoxystrobin at 00.31%

Verdict

Using the Scotts VB02423, you don’t need to be patient and wait for so long to see results because this fungicide is fast-acting formulated.

Best For Red Thread Control: BioAdvanced 701230A

BioAdvanced 701230A
BioAdvanced 701230A
Pros
  • Ability to control red thread well - propiconazole 0.51%
  • Last up to 1 month – rainproof formula
  • Easy to apply with a garden hose - granules
Cons
  • The price is high

Due to its active ingredient of propiconazole, the BioAdvanced 701230A is an effective preventative and curative treatment for red thread on St Augustine grass.

For the uninitiated, propiconazole is a systemic fungicide that is taken up by the plant’s roots and transported through the plant’s tissues, providing longer-lasting protection against various lawn diseases.

On the other hand, the product is rainproof, offering up to 1 month of protection against red thread and other listed fungus diseases.

The granules are easy to apply with a garden hose.

BioAdvanced 701230A Specifications

Form

Granules

Volume

10.1 Pounds

Active Ingredients

propiconazole 0.51%

Highlight Features

propiconazole 0.51%

rainproof formula

Verdict

We like the BioAdvanced 701230A because of its impressive performance in terms of red thread control.

Best For Dollar Spot Control: Bonide BND60514

Bonide BND60514
Bonide BND60514
Pros
  • Deliver effective dollar spot control - Thiophanate-methyl 2.08%
  • Ready to use & not require mixing - granules
Cons
  • No complaint

We are pleasantly impressed with the Bonide BND60514 for its broad spectrum of disease control.

This fungicide prevents and stops a variety of diseases in lawns and landscapes, including dollar spot, black spot, rust, etc. By offering total coverage of the lawn, the product provides effective disease control for St Augustine grass.

Additionally, the systemic control of the product ensures that the active ingredients will be absorbed and distributed throughout the entire system of the affected plant, allowing for more effective and long-lasting protection.

The granules are ready-to-use, so you do not have to mix them with any other chemicals or solutions, making it easy to apply.

Bonide BND60514 Specifications

Form

Granules

Volume

7.5 Pounds

Active Ingredients

Thiophanate-methyl 2.08%

Highlight Features

Thiophanate-methyl 2.08%

granules

Verdict

With the Bonide BND60514, you can be sure that you have the best product for dollar spot control for St Augustine grass.

Less Odor: Propiconazole 83013365

Propiconazole 83013365
Propiconazole 83013365
Pros
  • Low odors – microemulsion formulation
  • Easy to mix with other pesticides and fertilizers - highly tank-mix compatible
  • Easy to measure the dose exactly – built-in measuring cup
Cons
  • It takes time to deliver noticeable results
  • A bit pricey

When it comes to the Propiconazole 83013365, we'd like to describe it with three phrases: high efficacy, low odor, and excellent tank stability.

Unlike other counterparts, the formulation of this fungicide is a microemulsion that produces less odor, making it ideal for residential applications. And that's part of the reason why many landscapers and homeowners alike love this product.

Many also love it for the ease of mixing with other pesticides and fertilizers (as it is highly tank-mix compatible.)

Besides, it has a locally systemic mode of action, meaning it is absorbed through the leaf and works systemically on the plant. This ensures better coverage of the lawn or turf and protection against a range of diseases.

Propiconazole 83013365 Specifications

Form

Liquid

Volume

1 Quart

Active Ingredients

Propiconazole

Highlight Features

microemulsion formulation

highly tank-mix compatible

built-in measuring cup

Verdict

Looking for less-odor formulated fungicide for St Augustine grass? Look no further than the Propiconazole 83013365

Best For Long-Lasting Disease Control: Bonide 811

Bonide 811
Bonide 811
Pros
  • Ability to control diseases for very long - Copper Octanoate at 10%
  • Convenient – ready-to-mix formula
Cons
  • The product works slowly

The Bonide 811 contains Copper Octanoate, known for offering incredibly long-lasting disease control in turf and lawns compared to other active ingredients.

The reason is it's a contact fungicide and bactericide that can be applied to foliage to control or suppress various plant diseases.

It combines copper and octanoic acid, which deactivate fungal enzyme systems and prevent fungal spores from germinating. This prevents infection from occurring and results in long-lasting disease control.

In addition, the fungicide sticks to and remains active on plant surfaces even during typical wet PNW winters.

Bonide 811 Specifications

Form

Liquid

Volume

16 Fluid Ounces

Active Ingredients

Copper Octanoate (copper Soap) 10%

Highlight Features

Copper Octanoate at 10%

ready-to-mix formula

Verdict

If you are on the market for the best contact fungicide for St Augustine grass with long-lasting disease control, our favorite pick is the Bonide 811

Best For Rust Control: Southern Ag 029030

Southern Ag 029030
Southern Ag 029030
Pros
  • Effectively kill and prevent rust – Copper
  • Minimize the spread of the fungal infection – quick-acting formula
  • Easy to mix and apply
Cons
  • Not waterproof

The Southern Ag 029030 contains copper, which is highly effective at killing fungi that cause rust.

Copper also helps protect plants from further damage by providing a barrier against new infections. On top of that, the quick-acting formula helps to reduce the spread of the fungal infection, helping keep your lawn healthy.

Another benefit of this fungicide is the ease of use. The product is easy to mix and apply, making it convenient for use in large or small areas.

Southern Ag 029030 Specifications

Form

Liquid

Volume

32 Fluid Ounces

Active ingredients

Copper

Highlight Features

Copper

quick-acting formula

Easy to mix and apply

Verdict

The Southern Ag 029030 is an ideal choice for rust control in St Augustine grass. The product is highly effective at killing fungus and protecting plants from further damage, and it is also easy to mix and apply.

How To Choose The Best Fungicide For St Augustine Grass?

When choosing the best fungicide product for St Augustine grass, there are several factors to consider.

The very first thing to do is look for a fungicide product specifically labeled for use on St Augustine grass. This ensures that the product contains the right active ingredient to effectively control the disease.

It’s also important to identify the fungal disease in your lawn and check if the product is safe to use before picking one.

Identify The Fungal Disease

It is important to identify the fungal disease in order to select the right fungicide product.

Common diseases found on St Augustine grass include Brown Patch Disease, Gray Leaf Spot, and Necrotic Ring Spot.

If the grass is affected by gray leaf spot, then propiconazole, thiophanate methyl, myclobutanil, or azoxystrobin are commonly recommended fungicides.

For dollar spots, chlorothalonil is often recommended.

For brown patches, products containing tebuconazole, flutolanil, or trifloxystrobin may be more effective.

To kill and prevent rust, systemic fungicides containing propiconazole, thiophanate methyl, myclobutanil, or azoxystrobin are typically recommended.

Important note: Fungicides containing sulfur should be used with caution, as they can be very toxic.

Once the type of fungal disease has been identified, the best fungicide product can be chosen based on its efficacy against the particular disease present.

Prioritize EPA-Registered Fungicide Products

Typically, products registered with the EPA are effective in controlling diseases and safe for use on lawns.

Which Brands Make The Best Fungicide For St Augustine Grass?

Scotts

People love using Scotts fungicides for their turf because it is an effective and fast way to protect their lawns from common fungal diseases.

Scotts fungicide products provide a broad-spectrum protection, targeting different types of fungi such as Brown Patch, Red Thread, and Powdery Mildew.

The fungicides also act as protectants, providing a layer of defense for lawns before they are exposed to pathogens, making them the perfect solution for preventing lawn diseases.

Bonide

Bonide fungicides offer broad-spectrum protection against a variety of fungi, such as powdery mildew, downy mildew, black spot, peach leaf curl, rust, and other diseases.

They are also ready-to-use, which makes them convenient and easy to use. Plus, they are more environmentally friendly than synthetic fungicides and their active ingredients, such as copper octanoate, are effective in controlling and preventing fungal diseases.

FAQs

Does rain wash away fungicide for St Augustine grass?

Yes, rain can wash away some fungicide. It depends on the type of fungicide used and the amount and timing of the rainfall.

How often to apply fungicide to St Augustine grass?

The recommended frequency of fungicide application for St Augustine grass care is 3 to 6 times per year.

What happens if I apply too much fungicide to St Augustine grass?

Applying too much fungicide to St Augustine grass can burn the grass or kill beneficial microbes, which can lead to poor soil quality and damage the lawn.

What time of day is best to spray fungicide for St Augustine grass?

To get the best results when spraying fungicide on St Augustine grass, experts suggest applying fungicide in early morning or at night when temperatures are above 60°F.

Can I apply fungicide and fertilizer for St Augustine grass at the same time?

Yes, you can usually apply fungicide and fertilizer for St Augustine grass at the same time, as long as the labels of the products you are using allow tank mixing. It is important to follow the recommended application rates and timing for both products for best results.

Conclusion

St Augustine grass is a popular lawn option in many parts of the country, and with proper care, it can remain healthy and lush for years to come.

Thankfully, there are numerous fungicides available to help protect your lawn from diseases that could be detrimental. The best fungicide for St Augustine grass depends on the type of disease present and the size of the affected area, so make sure you do your research before making a purchase.

With an appropriate fungicide chosen, your yard should remain green and pristine year-round!

I’m Harry Ramos, who's crazy about all things green. I’m here to share some experience in my gardening adventure and how to choose the best products for your garden. Let's dig in, get our hands dirty, and celebrate the simple, earthy pleasures of the garden together!


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