Best lawn fungicide to control fungus in 2022

Fungicides are pesticides that kill or prevent the growth of fungi and their spores. You can use them to control fungi that damage plants. Other uses include the elimination of mold and mildew from homes.

While fungicides work in different ways, most of the chemicals damage the fungal cell membranes. Others interfere with the energy production within a fungal cell. Before buying a fungicide, ensure you are getting the best to eliminate fungi from your surroundings.

The market has different types of fungicides. Some only control specific diseases. For example, some fungicides can handle leaf spot diseases, cereal stem diseases, smuts, powdery mildews, and late blight or downy mildew.

Other fungicides can treat postharvest infections that cause fast and excessive breakdown of high-moisture products. Before buying any fungicide for lawn or garden, understand what it controls, or else you might end up with the wrong product.

Things to consider before buying lawn fungicide

Here are some things to consider when buying a lawn fungicide:

1. Type of fungicide

You can either buy preventive or curative fungicide. In other words, do you want a fungicide that will prevent the growth of fungus on your lawn or restore the health of your grass?

2. Contact or systemic fungicide

Most stores stock both contact and systemic fungicides. Contact fungicides will kill fungus upon contact. They are ideal for application in situations where you haven’t identified the type of fungus affecting your lawn.

Systemic fungicides, on the other hand, will suppress the fungus after infection. Once you spread it to your lawn, the plants will absorb the chemical into its system to control the fungus.

3. Broad-spectrum or narrow-spectrum fungicide

The best fungicide for lawns should be either broad-spectrum or narrow-spectrum.

Broad-spectrum means you can use the chemical to kill different types of fungi.  Narrow-spectrum, on the other hand, means the fungicide will work more effectively against specific types of fungi.

READ ALSO:  Is rock salt good for killing weeds?

What is the best lawn fungicide to control fungus?

If you are looking for the best lawn fungus control solution, here are some fungicides that are worth buying:

1. Scotts DiseaseEx Lawn Fungicide

Scotts DiseaseEx

Scotts DiseaseEx controls fungi that cause brown patches, powdery mildew, pythium root rot, take-all patch, zoysia patch, and more. The product offers broad-spectrum disease prevention on grasses affected by fungus.

Once applied, it finds its way into a plant’s system where it stays for up to four weeks. That ensures the plant will take control of the fungus even after infection.


  • It is fast-acting. Expect results within four weeks of application.
  • Comes in a 10lb bag that can treat an area of up to 5,000 square feet.
  • Safe to use around pets and people.
  • It will kill all root rot.


  • It is time-consuming to apply the product. You will have to spread the granules on your grass and then water it to work well.
  • Not organic.

If you are looking for a fast-acting fungicide for your lawn, consider purchasing the Scotts DiseaseEx. The product starts working within 24 hours of application and will give you results in four weeks

2. BioAdvanced 701270A Fungicide

BioAdvanced 701270A

BioAdvanced 701270A is an effective fungicide that can control diseases like the brown patch, red thread, dollar spot, rust, and more. It can control fungus from infecting your lawn by giving it 30-day protection.

When you apply it, your grass will absorb the systemic chemical and prevent the fungus from spreading. The best time to use this fungicide is at the first sign of disease.


  • It can treat up to 5,000 square feet.
  • It offers rainproof protection. The product will not wash off after application.
  • Forms a protective barrier outside of plants to prevent infection by diseases.
  • It works on your lawn for up to a month.


  • Takes time to kill fungus.

BioAdvanced 701270A is an effective systematic fungicide that works through the leaves and stems to protect and cure your lawn. You can use the product on grasses to treat an existing disease.

3. Southern Ag – Liquid Copper Fungicide

Southern Ag Liquid Copper Fungicide

Southern AG Liquid Copper is a fungicide that controls diseases caused by bacteria and fungi. It can also control moss and algae on your lawn and moss in live oaks.

You can use it on fruits, vegetables, turfgrass (algae control), live oak (Spanish moss control), and ornamentals.

READ ALSO:  Do organic weed killers work? Everything you should know


  • It will control many bacterial and fungal leaf spots, rust, and blights.
  • Works well even when the plant is growing.
  • It is cheap compared to similar fungicides.


  • The product contains a copper diammonia diacetate complex, which can be harmful to humans and pets.

As a liquid fungicide for lawns, Southern AG Liquid Copper will control diseases in any season. You can apply it in May during the growth period and in September before the fall rains.

4. Bonide 811 Copper 4E Fungicide

Bonide 811 Copper 4E Fungicide

Bonide 811 Copper 4E is a fungicide for controlling plant diseases. You can apply it in areas affected with diseases like powdery mildew, downy mildew, peach leaf curl, black spot, and many others.

The product contains copper octanoate as the active ingredient of liquid copper. It is a naturally occurring chemical that makes it an ideal option for use on plants.


  • It can protect different types of plants, including listed vegetables, roses, fruits, nuts, herbs, ornamentals, and turfs.
  • Suitable for organic gardening.
  • It is a natural fungicide designed to be safe to use around pets and people.
  • Easy to apply.


  • It can kill trees on contact.
  • The quantity is too small (16 FL OZ) to apply in a large area.

Bonide 811 Copper 4E is a fungicide that gives you a natural solution for controlling diseases on your lawn. The best way of using it is to mix with water and then apply it to your grass using a hose-end sprayer or tank sprayer.

5. Quali-Pro Propiconazole 14.3 Fungicide

Propiconazole 83013365

Quali-Pro Propiconazole 14.3 is a broad-spectrum fungicide that controls diseases on grasses, flowers, shrubs, and trees. The product works well in cool and warm climates to prevent infection by fungus on your lawn.

You can use the chemical to get rid of gray leaf spot, dollar spot, zoysia patch, summer patch, brown patch, powdery mildew, and anthracnose.


  • It offers broad-spectrum and systemic disease control on turfs and ornamentals.
  • Applicable in many areas, including nurseries, landscapes, turfs, trees, golf courses, and tree injection.
  • It has a microemulsion formulation that ensures less odor and excellent plant coverage.
  • You can use it on newly seeded lawns.
  • Does not have a growth inhibitor.


  • The product is too pricey.

The advantage of using Quali-Pro Propiconazole 14.3 fungicide is it will give you results within three weeks of application. Apply it as directed by the manufacturer.

When should I apply fungicide to my lawn?

If you want to use a fungicide as a preventative measure, the best time for applying the product is in the late spring to early summer.

READ ALSO:  Spectracide vs Roundup: Which herbicide works best?

In most cases, a brown patch becomes apparent around the beginning of May. If you are dealing with warm-season turfgrass, apply the fungicide in spring.

However, in many cases, the ideal time to control diseases using fungicides is during fall. Avoid putting it down in seasons where you are unlikely to see fungal growth.

Generally, apply fungicides on lawns as a preventative measure to ensure fungus does not grow. You should also use disease forecasting systems to ensure you apply the chemicals when needed.

Forecasting systems will look at your local temperature, leaf wetness, and relative humidity to determine the type of fungicide to use on your lawn.

You should apply fungicides during morning hours. If the temperature in your area is above 90 degrees Fahrenheit, wait until it is cooler.

How long does it take for a fungicide to work on grass?

It may not be easy to determine the time it takes for the fungicide to work on grass. It depends on the type of fungicide you are using and its chemical composition.

Most fungicides will start working within 24 hours of application to control common lawn diseases. The chemicals will be powerful enough for between a week and four weeks.

Will a fungicide hurt a lawn?

Fungicides can be harmful to your lawn. Although the chemicals will kill the fungi, they will hurt your grass if you use them in excessive dosages or amounts.

Furthermore, over-application will kill off the good fungi in the soil and open the door for many more problems. Avoid applying lawn fungus control products to newly growing grass since they may damage the seedlings.


If you are thinking of buying a grass fungicide to control fungus on your lawn, consider Quali-Pro Propiconazole 14.3 Fungicide, Scotts DiseaseEx Lawn Fungicide, or BioAdvanced 7071270A Fungicide.

The products will work by handling diseases that affect your grass. They will kill diseases like a red thread, brown patch, dollar spot, and rust.

For the best results, apply them as directed by the manufacturer.

Related Guides