Lawn Fungus Treatment

If you have a lawn, chances are you’ve had to deal with some kind of fungus before. Fungi can cause all kinds of problems for your grass, from discoloration and wilting to patches of dead turf. But don’t worry—treating lawn fungus doesn’t have to be difficult or expensive! With the right knowledge and products, you can get rid of those unsightly spots quickly and effectively. In this article, we’ll cover the different types of fungi that plague our lawns, how to recognize them early on, and various ways to treat them so that your grass looks beautiful again in no time.

Lawn Fungus Treatment

Types of Fungi

The most common type of lawn fungus is called powdery mildew. It appears as a white, powder-like coating on the leaves and stems of grass, and it’s especially prevalent in humid climates. Fairy rings are another common culprit. These circular patches of green grass or mushrooms can appear in your yard, usually caused by fungi living in the soil that’s gotten too wet from over-watering or heavy rains. And finally, the red thread is an insidious type of fungus that causes reddish-brown spots on the blades of grass.

Powdery Mildew

Powdery mildew is a fungal disease that affects the leaves of many plants, including lawn grass. It is characterized by white, powdery spots on the leaves, which can spread to cover the entire leaf surface.

To prevent powdery mildew on your lawn, consider the following steps:

Proper mowing: Mow your lawn regularly, but do not cut it too short. This helps prevent moisture buildup on the leaves and reduces the risk of powdery mildew.

Watering: Water your lawn in the early morning or late afternoon, allowing the grass to dry completely before nightfall. Avoid watering the leaves, as this can create favorable conditions for the development of powdery mildew.

Fertilization: Provide your lawn with the appropriate nutrients, but avoid over-fertilizing, as this can create favorable conditions for the development of powdery mildew.

Improved air circulation: Encourage good air circulation in your lawn by removing any dead or diseased grass and avoiding the overcrowding of plants.

Fairy Rings

Fairy rings are a naturally occurring phenomenon in lawns that are caused by fungi. Fairy rings can produce rings or arcs of dead grass, lush green grass that grows quicker than the rest of the lawn, or mushrooms. Fairy rings are often seen in woods and forested areas where they can be decades old and grow to over ten meters in diameter.

The fungi that cause fairy rings feed on decaying matter, such as old stumps or wood. The fungi in the soil can also produce a substance that speeds up the growth, resulting in accelerated growth fairy rings.

To remove fairy rings from a lawn, it is recommended to measure out one foot from the outside of the ring, remove the sod, dig up the soil to a depth of one foot, and replace the soil and re-sod or re-seed.

Seeding is preferred because there is less likelihood of re-establishing the fungus, but this can be difficult, and even a little spilled soil can start the fungus again.

Red Thread

Red thread is a fungal disease that affects lawns and is caused by Laetisaria fuciformis. The symptoms of red thread are initially brown patches in the grass, followed by thin, red or pink strands of fungus that become difficult to miss as the infection progresses. The disease is most common in areas with high rainfall or high humidity in late spring to summer, with conditions such as low levels of nitrogen or inadequate overall fertilization, temperatures between 68 and 75 degrees Fahrenheit, high humidity, and low light levels being favorable for the disease to thrive.

To identify red thread, it’s best to look for it in the early morning when there is still dew on the blades, and it appears darker red in color when wet, and more pink when dry.

Treatment Options

When dealing with lawn fungus, it is important to choose the right treatment option for your particular situation. Depending on the type of fungus and severity of the infestation, different treatments may be more effective than others. Here are some potential treatment options you may wish to consider:

Natural Remedies
For those looking for a more natural way to treat fungal infestations, there are many home remedies that can be employed. For example, milk can be sprayed on the affected areas of your lawn to help reduce the severity of powdery mildew and other fungal infections. Additionally, baking soda mixed with water can help to control the spread of red thread.

Chemical Treatments
In cases where home remedies are not sufficient, chemical fungicides may be necessary to treat lawn fungus. These products contain various chemicals that work to kill the fungi and prevent it from spreading further.

When using chemical fungicides, be sure to follow the instructions and wear protective clothing.


In conclusion, lawn fungus can cause significant damage to your lawn if it is not treated properly. Be sure to recognize the signs of fungal infestations, such as brown patches or strings of red thread and take appropriate action quickly. Utilizing natural remedies, chemical treatments, and encouraging proper lawn care practices can help keep your lawn fungus-free.

By taking proactive measures and being diligent about recognizing the signs of fungal infestations, you can protect your lawn from the damaging effects of fungi. With proper treatment, you will be able to maintain a beautiful and healthy lawn for years to come!

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