Reasons Why Your Grass Is Turning White

When we come across white grass patches on our lawns, it can be a troubling sight for any homeowner. A once lush, green lawn can quickly become marred by sudden patches of white, leaving you wondering what has gone wrong.

Your grass is turning white, due to powdery mildew, Fusarium patch disease, gray leaf spot, and even the side effects of herbicide. Luckily, all of these diseases are treatable with natural remedies like baking soda or neem oil.

In this article, we will explore the various reasons why your grass might be turning white, including powdery mildew, Fusarium patch disease, gray leaf spot, and even the side effects of herbicides.

Understanding these factors is crucial to restoring your lawn’s vibrant green appearance.

The Common Culprits

White Mold

White mold is a dangerous foe that can threaten the health of your lawn. Recognized by fluffy white mycelium on grass blades, this fungus thrives in humid conditions, swiftly spreading across your lawn and robbing it of its natural green beauty.

Treatment: To tackle white mold, it’s recommended fungicide to use is chlorothalonil. Chlorothalonil is an effective broad-spectrum fungicide that can help control and prevent the spread of white mold on your lawn.

When using any fungicide, carefully follow the manufacturer’s instructions and safety guidelines for application.

In addition to fungicide treatment, consider pruning any overhanging branches or removing obstacles that obstruct sunlight exposure to your lawn. Enhanced airflow and sunlight can further aid in preventing the recurrence of white mold.

Powdery Mildew

Powdery mildew is a common fungal issue that can result in white grass. The presence of a powdery white substance on the grass blades characterizes this problem, which is notably common in regions with high humidity.

Treatment: Similar to addressing white mold, the treatment for powdery mildew involves the use of fungicides. One effective and environmentally friendly solution for powdery mildew is neem oil.

Neem oil is a natural fungicide that can combat the issue without harming the environment.

Besides applying fungicide, regularly monitoring your lawn’s moisture levels and ensuring adequate airflow is crucial to prevent the recurrence of powdery mildew.

In addition to neem oil, a fungicide that can be used to treat powdery mildew will have to be sulfur-based. Sulfur-based fungicides are effective in controlling and avoiding powdery mildew on your lawn.

When applying any fungicide to your lawn, wear gloves and properly follow the manufacturer’s instructions for correct usage and safety measures.

Fusarium Patch Disease

Fusarium patch disease is a troublesome grass ailment characterized by the emergence of irregular white or pinkish patches on your lawn.

This unsightly issue is a clear indicator of an unhealthy lawn and can substantially diminish the overall visual appeal of your yard.

Treatment: To combat Fusarium patch disease, it is advisable to use a fungicide specifically formulated to address this disease. One effective fungicide for Fusarium patch disease is azoxystrobin.

Applying the fungicide, carefully adhere to the product’s instructions. Additionally, ensure good lawn health by maintaining proper drainage and aeration and making necessary adjustments to your lawn care practices to prevent the disease from recurring.

Gray Leaf Spot

Gray leaf spot is a fungal disease that exhibits irregular, bleached spots on your grass blades. Over time, these spots can develop into white patches, resulting in noticeable discoloration across your lawn.

Treatment: To combat gray leaf spot effectively, the appropriate fungicide for addressing gray leaf spot is propiconazole. When applying the fungicide, ensure strict adherence to the product’s guidelines for proper usage.

Additionally, maintain your lawn’s health by regularly mowing it at the correct height, facilitating proper air circulation. To prevent the disease’s spread, diligently remove affected grass clippings from your lawn.

Side Effects of Herbicide

Misapplication or overuse of herbicides can result in unintended outcomes for your lawn. In some cases, the misuse of herbicides can lead to localized discoloration, causing the affected grass to turn white where the chemicals were applied.

Treatment: To effectively decrease the side effects of herbicide-induced discoloration, it is crucial to avoid misapplication. Follow the instructions provided on the product label carefully when applying herbicides.

In the event of localized discoloration, consider overseeding or reseeding the affected areas using a quality grass seed blend suitable for your region. Ensure you adhere to proper lawn care practices to encourage healthy regrowth.

Addressing the Issue

  1. Identifying the Problem

    The first step in dealing with white grass is identifying the root cause. Is it a fungal issue like white mold or powdery mildew, a disease like Fusarium patch disease or gray leaf spot, or herbicide-related discoloration?
  1. Fungicide and Treatment

    For fungal problems like white mold, powdery mildew, Fusarium patch disease, and gray leaf spot, using a suitable fungicide is often the best approach. Ensure that you follow the application instructions carefully.
  1. Adjusting Lawn Care Practices

    Regular lawn maintenance, aeration, and dethatching can help prevent and manage various grass issues. A healthy lawn is better equipped to resist diseases and discoloration.
  1. Herbicide Awareness

    If you suspect herbicides cause white grass, be cautious with their use. Always follow the instructions on the product label, and consider natural alternatives if possible.

Natural Remedies: Neem Oil and Baking Soda

Neem Oil

Neem oil is a versatile and environmentally friendly remedy that can effectively combat mild cases of white mold and powdery mildew on your lawn. 

Derived from the neem tree (Azadirachta indica), this natural oil has powerful antifungal properties. When applied as a fungicide, neem oil works by breaking up the growth and reproduction of the fungi responsible for these lawn issues.

It’s safe for your lawn, humans, and pets, making it a preferred choice for environmentally conscious homeowners.

Baking Soda Solution

Baking soda, a common household ingredient, is another natural remedy for white mold and powdery mildew. When mixed with water, it creates an alkaline solution that alters the pH on the leaf surface of your grass. 

This change in pH disrupts the growth of the fungi, hindering their ability to thrive and spread. Baking soda is an eco-friendly option that poses minimal risks to your lawn, environment, and the health of those living around it.

For optimal results, it’s important to apply neem oil and the baking soda solution as directed and during the recommended times in the plant growth cycle.

These natural remedies are most effective for mild cases of white mold and powdery mildew. In severe cases, or if the issue persists, it may be necessary to consider professional fungicide treatments to ensure your lawn remains healthy and vibrant.

How can I make my lawn more resistant to white grass issues?

A key strategy in preventing and reducing the risk of white grass issues is to bolster the overall health of your lawn.

A healthy lawn is naturally more resistant to a range of problems, including fungal diseases and discoloration. Here’s how you can enhance your lawn’s resistance:

Proper Watering

Ensure that your lawn receives the right amount of water. Avoid overwatering, which can create waterlogged soil, providing an ideal environment for fungi to thrive.

Conversely, under-watering can weaken the grass, making it more prone to issues. Strive to find the right balance in your watering routine, taking into account the specific needs of your grass type and the local climate.


Regular mowing is crucial for maintaining a healthy lawn. The correct mowing height is key. Cutting the grass too short can stress it and expose the soil to excessive sunlight while leaving it too long can create a humid environment conducive to fungal growth.

Follow the recommended mowing height for your grass variety and ensure your mower blades are sharp for clean cuts.

Overall Lawn Care

Effective lawn care practices play a vital role in promoting a green, resilient lawn. Regular aeration and dethatching help improve soil health, reduce compaction, and enhance drainage, reducing the risk of fungal issues.

Fertilize your lawn appropriately to provide it with essential nutrients for vigorous growth. Addressing issues like poor drainage, compacted soil, and thatch buildup will contribute to a more resilient lawn.


The sight of white grass patches on your once-thriving lawn can be disheartening, but understanding the causes and appropriate treatments is paramount.

We’ve delved into fungal issues such as powdery mildew, Fusarium patch disease, gray leaf spot, and the unintended consequences of herbicide misuse.

To address these issues effectively, it’s crucial to identify the root cause and implement the right treatment, whether that involves using fungicides or making thoughtful adjustments to your lawn care routine.

The key to preventing these problems from recurring lies in maintaining a healthy lawn.

This means adhering to proper watering, mowing, and overall lawn care practices that enhance your lawn’s resilience. A well-maintained lawn is naturally more resistant to a range of issues, including white grass.

In the end, by following these comprehensive guidelines, you can restore your lawn’s vibrancy and enjoy a lush and green outdoor space.

Your commitment to these practices ensures that your lawn remains a vibrant, thriving landscape for you to relish.

Manny Moore

Getting my hands dirty and building a place that me and my small family love is a driving factor for what I do and how I do it. I want to share what I have learned and practiced so that it is just that much easier for everyone to have another tool in their tool belt. Your home should be a place that you love and feel comfortable in and your backyard should be no different.

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