Common Lawn Diseases and How to Treat Them

Hey there, fellow green thumbs! As an eclectic master gardener, I’ve seen my fair share of lawn diseases throughout the years. From pesky brown patches to unsightly mold growths, these issues can quickly turn a lush lawn into a barren wasteland if left untreated. But fear not! With the right knowledge and treatment methods, you can combat these common lawn diseases and restore your yard to its former glory.

First up on our list is one of the most prevalent lawn diseases: brown patch. This fungal infection thrives in warm, humid conditions and can quickly spread throughout your lawn if not addressed promptly. Symptoms include circular patches of dead grass surrounded by a ring of dark green or yellowing blades.

Luckily, treating brown patch is relatively simple with fungicides and proper watering techniques. So let’s dive into some more common lawn diseases and how to treat them like a pro!

Brown Patch

As a seasoned master gardener, I have seen my fair share of lawn diseases. One that often plagues homeowners and landscapers alike is brown patch. This fungal disease thrives in warm, humid conditions and can quickly spread throughout your lawn if left untreated.

Brown patch presents itself as circular patches of dead or dying grass that are brown or yellow in color. These patches can range from a few inches to several feet in diameter and often appear overnight.

If you notice any areas of your lawn with these symptoms, it’s important to take action immediately to prevent the disease from spreading.

To treat brown patch, start by reducing the amount of water you’re giving your lawn. Overwatering can create ideal conditions for the fungus to grow and spread.

Additionally, make sure you’re mowing your lawn at the proper height for your grass type – cutting it too short can stress the grass and make it more susceptible to disease.

Finally, consider applying a fungicide specifically designed to treat brown patch to affected areas of your lawn. With these steps, you can effectively treat and prevent brown patch from taking over your beautiful green space.

Dollar Spot

Dollar Spot is a common lawn disease that affects many lawns, so it’s important to know what it is and how to treat it.

Its cause is usually attributed to a combination of high humidity and hot temperatures, coupled with poor soil drainage.

Symptoms of Dollar Spot include brown, circular patches in the lawn, and thinning or wilting of the grass in the affected areas.

Treating Dollar Spot usually involves increasing air circulation in the affected area, as well as applying fungicides.

Additionally, it’s important to keep your lawn healthy and well-nourished so it can resist the disease.

Finally, regular mowing and de-thatching your lawn can help prevent the disease from occurring in the first place.

Causes Of Dollar Spot

Picture yourself strolling through your lush green lawn. You’re admiring the vibrant colors and healthy blades of grass when suddenly, you spot a small patch of brown spots. This could be an indication of Dollar Spot, a common fungal disease that attacks lawns across the country.

Dollar Spot is caused by environmental stressors like excessive moisture, low nitrogen levels in the soil, and high humidity. As an eclectic master gardener, I’ve seen my fair share of Dollar Spot outbreaks. One of the primary causes of this disease is overwatering. When grass remains wet for extended periods due to overwatering or rainfall, it creates an optimal environment for fungi to thrive. Additionally, low levels of nitrogen in the soil can weaken grass blades and make them more susceptible to disease. High humidity is another factor that contributes to Dollar Spot’s spread.

If you suspect your lawn has been infected with Dollar Spot, there are several treatment options available. The first step is to reduce watering and increase drainage to prevent further moisture buildup. Adding fertilizer with high levels of nitrogen can also help strengthen weakened grass blades and restore their health. Fungicides can also be applied to prevent the disease from spreading further and help heal existing patches.

As always, prevention is key – implementing proper lawn care practices such as regular mowing and avoiding over-fertilization can go a long way in keeping your lawn healthy and free from diseases like Dollar Spot.

Symptoms Of Dollar Spot

Now that we’ve discussed the causes of Dollar Spot, let’s move on to its symptoms.

One of the most noticeable signs of this disease is the appearance of small, circular or oblong-shaped patches in your lawn. These patches are usually around 1-4 inches in diameter and have a tan or straw-colored center with a reddish-brown border. Over time, these patches can merge together and form large areas of dead grass.

Another symptom to look out for is the presence of white cobweb-like threads on the affected grass blades. This is actually a sign that the fungus is active and feeding on your lawn.

You might also notice that your grass blades appear thin and weakened, which makes them more susceptible to breaking off easily.

Lastly, Dollar Spot can cause your lawn to take on an overall yellowish or brownish hue. This discoloration occurs because the disease attacks the green chlorophyll in your grass blades, leaving behind only dry and lifeless tissue.

If you notice any combination of these symptoms in your lawn, it’s time to take action before the disease spreads even further. Remember, early detection is key when it comes to treating Dollar Spot. Keep an eye out for these symptoms and act quickly to prevent further damage to your beloved lawn!

Treatments For Dollar Spot

Now that we’ve identified the symptoms of Dollar Spot in your lawn, it’s time to discuss treatments.

As an eclectic master gardener, I have seen a variety of methods used to combat this disease.

The most effective treatment for Dollar Spot is prevention.

By properly maintaining your lawn with regular watering, fertilization, and mowing, you can create an environment that is less susceptible to the fungus.

However, if Dollar Spot has already taken hold in your lawn, there are several options available.

One option is to apply fungicides specifically designed for Dollar Spot.

These products work by preventing the fungus from spreading and killing off any existing growth.

It’s important to note that not all fungicides are created equal – be sure to read labels carefully and choose a product that is effective against Dollar Spot.

Another option is to improve the overall health of your lawn through cultural practices such as overseeding or aerating.

By introducing new grass varieties or creating channels for oxygen and nutrients to reach the roots, you can help your lawn fight off diseases like Dollar Spot on its own.

In conclusion, treating Dollar Spot requires a combination of preventative measures and targeted treatments.

As a master gardener, I recommend starting with proper maintenance and only using fungicides or other treatments as needed.

With patience and persistence, you can restore your lawn to its former glory!


Rust is a common lawn disease that affects many types of grasses. It is caused by a fungal infection, typically when the weather is cool and moist.

The disease appears as orange or brownish-red spots on the blades of grass, and can quickly spread throughout the lawn if left untreated.

To treat rust, it’s important to first identify the infected areas and remove any dead or diseased grass. This can be done by mowing the lawn at a higher setting, to encourage new growth and improve air circulation.

Additionally, applying a nitrogen-rich fertilizer can help boost the health of your lawn and prevent further spread of rust.

Preventative measures are also key in managing rust in your lawn. Avoid overwatering your lawn, as excess moisture can create a breeding ground for fungal infections.

It’s also important to regularly aerate your soil and maintain proper turf height, as these practices can promote healthy growth and reduce the risk of disease.

By taking proactive steps to care for your lawn, you can keep it looking green and lush all season long.

Powdery Mildew

Symptoms of Powdery Mildew: Look out for a white, powdery coating on the surface of your lawn’s leaves. It’s a telltale sign of Powdery Mildew.

Causes of Powdery Mildew: This fungus is caused by high humidity and warm temperatures. It’s a common occurrence during the summer months.

Treating Powdery Mildew:
I recommend removing the infected leaves and reducing the humidity in your lawn.
You can also use a fungicide to get rid of the mildew.

Symptoms Of Powdery Mildew

Are you noticing a white or grayish powdery substance on the leaves of your lawn? If so, it may be an indication of powdery mildew. This fungal disease can affect a wide range of plants, including lawns. As an eclectic master gardener, I have seen this issue many times and know how to spot the symptoms.

Symptoms of powdery mildew on your lawn include white or grayish powder-like patches on the leaves, stems, and even flowers. You may also notice distorted growth or stunted plant development. In severe cases, the leaves may turn yellow or brown and fall off prematurely. It’s important to catch these symptoms early to prevent further damage.

To treat powdery mildew on your lawn, start by removing any infected plant material and disposing of it properly. Then, improve air circulation by pruning back overgrown branches and thinning out crowded areas in your garden. Fungicides containing sulfur or potassium bicarbonate can also be effective in treating powdery mildew. Be sure to follow all instructions carefully to avoid damaging your lawn further.

With proper care and attention, you can successfully treat powdery mildew and restore the health of your lawn.

Causes Of Powdery Mildew

Now that we have discussed the symptoms of powdery mildew on your lawn, let’s delve into its causes.

Powdery mildew is a fungal disease that thrives in warm and humid conditions. It often affects plants that are crowded or have poor air circulation. Overwatering, high humidity levels, and low light conditions can also contribute to the development of powdery mildew.

One cause of powdery mildew on your lawn is the presence of infected plant materials nearby. Spores from infected plants can easily spread to your lawn through the wind or insects. Additionally, using contaminated gardening tools or equipment can also introduce powdery mildew to your lawn.

Another cause of powdery mildew is poor soil nutrition and pH levels. Plants that lack essential nutrients such as nitrogen, phosphorus, and potassium are more susceptible to diseases like powdery mildew. Additionally, if the pH level of your soil is too high or too low, it can create an environment that is conducive for fungal growth.

Understanding the causes of powdery mildew on your lawn is crucial in preventing its occurrence in the future. By addressing these underlying issues and implementing proper care techniques, you can keep your lawn healthy and free from this fungal disease.

Treating Powdery Mildew

Now that we have a good understanding of the causes of powdery mildew on your lawn, let’s discuss how to treat it.

As an eclectic master gardener, I can tell you that there are several methods you can use to combat powdery mildew.

The first step in treating this fungal disease is to remove any infected plant materials from your lawn. This will help prevent the spread of spores and stop the disease from advancing.

Next, improve air circulation by thinning out any overcrowded plants and pruning back overgrown branches. This will help reduce humidity levels and create a less favorable environment for fungal growth.

Another effective method for treating powdery mildew is to use natural remedies such as neem oil or baking soda solutions. These solutions work by disrupting the cell walls of the fungus, ultimately killing it off. You can apply these remedies using a sprayer or by wiping them onto affected areas with a cloth.

By implementing these techniques and addressing underlying issues such as poor soil nutrition and pH levels, you can effectively treat powdery mildew on your lawn and prevent its recurrence in the future.

Remember, prevention is always better than cure when it comes to gardening!

Fusarium Blight

Fusarium blight is a common lawn disease that can take hold during periods of high humidity and warm temperatures. It is caused by a fungus called Fusarium, which attacks the grass blades and stems, causing them to wilt and turn brown.

The disease can spread quickly if left untreated, so it’s important to recognize the signs of infection early on.

One of the most effective ways to treat Fusarium blight is to maintain proper lawn care practices. This includes regular mowing, watering, and fertilization.

Mowing your lawn at the appropriate height will help prevent stress on the grass blades, while watering deeply but infrequently will encourage deeper root growth. Additionally, using a slow-release fertilizer will provide your grass with the nutrients it needs without promoting excessive growth.

If your lawn has already been infected with Fusarium blight, there are several treatment options available. Fungicides can be applied to affected areas to control the spread of the disease. Additionally, aerating your lawn can improve drainage and air circulation, reducing conditions that are favorable for fungal growth. Removing any debris from your lawn, such as fallen leaves or clippings, can also help prevent further infection.

Consider overseeding with a resistant variety of grass.

Avoid overwatering or watering in the evening.

Monitor soil pH levels and adjust if necessary.

Consult with a professional landscaper for specialized treatment options.

Remember that prevention is always better than cure when it comes to Fusarium blight. By maintaining healthy lawn care practices and taking action at the first sign of infection, you can keep your lawn looking lush and green all season long.


In conclusion, as a master gardener with years of experience, I can attest to the fact that lawn diseases are a common problem that many homeowners face. Fortunately, identifying and treating these diseases is relatively straightforward if you know what to look for.

One interesting statistic that highlights the importance of taking care of your lawn is that a healthy lawn can increase a home’s value by up to 15 percent. This just goes to show how important it is to keep your lawn in top-notch condition.

Remember, prevention is key when it comes to lawn diseases. Make sure to maintain proper watering and mowing practices, and be on the lookout for any signs of disease.

If you do notice something wrong with your lawn, don’t panic! With the right treatment plan and a little patience, your lawn will be back to its vibrant self in no time.