How to Treat Brown Patch in St Augustine Grass?

Brown patch is a disease that affects turfgrass, specifically St. Augustine grass. The disease is caused by a fungus called Rhizoctonia solani. Brown patch appears as circular or irregularly shaped patches of brown or tan grass.

The patches can range in size from a few inches to several feet in diameter. Brown patch is most active during warm, humid weather and is typically seen in the spring and fall.


How To Control And Treat Fungus In St. Augustine Grass (Brown Patch/Large Patch Fungus)

  • Water your St
  • Augustine grass deeply and regularly during hot, dry weather to keep the root system healthy and prevent brown patch from developing
  • Mow your grass at the recommended height for your particular variety of St
  • Augustine grass to promote good air circulation and discourage fungal growth
  • Apply a fungicide specifically labeled for use on brown patch in St
  • Augustine grass according to the manufacturer’s instructions if you notice brown patches starting to form
  • Rake up and remove any dead or dying grass from brown patches to help control the spread of the disease and improve the overall appearance of your lawn
  • Reseed bare spots with fresh St
  • Augustine grass seed once the weather cools down and conditions are more favorable for new seedlings to take root successfully

Best Fungicide for Brown Patch in St Augustine

If you have a lawn in St. Augustine, FL, chances are good that you’ve seen brown patch. This fungal disease affects all types of turfgrass, but is especially common in St. Augustine grass. Brown patch appears as large, circular patches of brown or tan grass.

The leaves may be rolled or dead, and the affected area may be surrounded by a yellow halo. Brown patch is most active during warm, humid weather – exactly the kind of weather we get in Florida! The fungus that causes brown patch thrives in wet conditions, so it’s important to take steps to prevent the disease from taking hold in your lawn.

The best way to prevent brown patch is to water early in the day so that the grass has time to dry out before nightfall. Watering deeply and less often is better than watering shallowly and more often – this will encourage deeper root growth which will make your lawn more resistant to stress (including drought). Be sure to rake up any dead grass clippings after mowing – these can provide a perfect environment for brown patch to take hold.

And finally, use a fungicide specifically designed for brown patch control on your lawn regularly during the spring and summer months when conditions are most favorable for disease development. There are several effective fungicides available for controlling brown patch on St. Augustine grass lawns. Products containing chlorothalonil or mancozeb are typically very effective at preventing and killing existing brown patches caused by Rhizoctonia solani fungi .

Fungicides containing propiconazole or trifloxystrobin are also effective against different strains of fungi that cause this disease .

How to Treat Brown Patch in St Augustine Grass?


Will St Augustine Recover from Brown Patch?

Brown patch is a common lawn disease that affects St. Augustine grass. The disease is caused by a fungus called Rhizoctonia solani. Brown patch appears as circular patches of brown or reddish-brown grass.

The patches can range in size from a few inches to several feet in diameter. The edges of the patches may be slightly raised, and the center of the patch may be sunken or have a small hole in it.

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Brown patch is most active during warm, humid weather conditions.

The disease often occurs in late spring or early summer when temperatures are in the 80s and 90s Fahrenheit and humidity is high. Brown patch can also occur during cooler weather periods if conditions are favorable for the fungus to grow. St. Augustine grass is very susceptible to brown patch, but there are some varieties that are more resistant than others.

Resistant varieties include ‘Floratam’, ‘Bitterblue’, and ‘Seville’. There are several things that you can do to help prevent brown patch from occurring in your lawn: 1) Mow your lawn at the recommended height for your particular variety of St Augustine grass.

Mowing too low increases the chances of brownpatch developing because it weakens the grass and makes it more susceptible to injury from heat, drought, and traffic stressors like walking or playing on the turfgrass area.. Recommended mowing heights for different types of St Augustine grass can be found here: https://www2.caes2uconnedu/turf/publications/Mowing%20Heights%20for%20Commonly%20Used%20Turfgrassespdf .

Depending on the time of year, you should adjust your mowing height accordingly so that you are not cutting off more than 1/3 of the leaf blade each time you mow.. This helps reduce stress on the turfgrass plant which could make it more susceptible to diseases like brownpatch.

. If you have already cut your lawn too short this season, scalping (mowing very short) once will not kill your lawn but should only be done as a last resort measure.. 2) Water deeply but infrequently.. Over-watering encourages fungal growth while watering deeply less frequently will help promote deeper root growth which makes turfgrass plants less susceptible to diseases.. 3) Use organic matter such as composted leaves or manure to improve drainage and aeration in compacted soils where water doesn’t drain well..

What Causes Brown Patches in Saint Augustine Grass?

There are several possible causes of brown patches in Saint Augustine grass. One common cause is the presence of thatch, which is a layer of dead and decaying grass clippings that accumulates on the surface of the lawn. If thatch becomes too thick, it can prevent water and nutrients from reaching the roots of the grass, causing the grass to turn brown and die.

Other possible causes of brown patches include compacted soil, poor drainage, excessive fertilizer application, insect damage, or diseases such as rust or dollar spot. Sometimes, brown patches can also be caused by dog urine or other pet waste. To determine the cause of brown patches in your lawn, take a close look at the affected area and try to identify any potential problems.

If you suspect that thatch is to blame, you can use a power rake or vertical mower to remove it. For compacted soil or poor drainage issues, you may need to aerate your lawn or install drainage pipes. If you think insects are damaging your grass, contact a pest control company for help.

And if you suspect your lawn has a disease, bring a sample of affected turf to your local cooperative extension office for diagnosis and treatment recommendations.

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How Do You Stop Brown Patches on St. Augustine Grass?

If you have brown patches on your St. Augustine grass, don’t despair! There are a few things you can do to try to fix the problem. First, take a look at the affected area and see if there is any obvious reason for the browning, such as pet urine or excessive foot traffic.

If so, simply address that issue and the grass should start to green up again on its own. Next, check your soil pH levels. St. Augustine grass prefers slightly acidic soil, so if your soil is too alkaline it could be causing the brown patches.

You can test your soil yourself with a home testing kit or by sending a sample to a local cooperative extension office. If your soil is too alkaline, you can lower the pH with sulfur or an acidifying fertilizer. Be sure to follow the directions on whatever product you use; using too much can damage your lawn further.

Finally, make sure that your lawn is getting enough water. Brown patches can sometimes be caused by drought stress, particularly in hot summer months. Water deeply and regularly (about 1 inch per week) to keep your lawn healthy and green.

What is the Best Fungicide for Brown Patch?

There are a few different fungicides that can be effective against brown patch, depending on the specific circumstances. For example, products containing chlorothalonil or mancozeb can help to prevent the development of brown patch. Some fungicides must be applied before the disease appears, in order to be effective, while others can be used once the disease has already started.

In general, it is best to consult with a local extension agent or other expert before using any fungicide, to ensure that it will be effective against the particular strain of brown patch present and that it will not harm any beneficial organisms in the area.


If you have brown patch in your St. Augustine grass, don’t despair. There are things you can do to treat it and get your lawn back to looking its best. First, try to identify the cause of the brown patch.

Is it due to too much shade? Not enough water? A disease?

Once you know the cause, you can take steps to correct it. If too much shade is the problem, consider trimming trees or shrubs that are shading your lawn. If lack of water is the issue, make sure you’re watering deeply and regularly.

And if a disease is to blame, there are fungicides available that can help treat brown patch. With a little effort, you can get rid of brown patch and have a beautiful green lawn again.