Brown Patch Fungus: What It Looks Like and How to Get Rid of It

How to Identify and Control Brown Patch Fungus in Your Lawn

Brown patch fungus is one of the most aggressive and widespread lawn diseases in Texas, Illinois, and Northwest Indiana. You may wake up to find brown, irregular patches that seemed to appear overnight. These spots are not just unsightly—they’re a warning sign of deeper lawn health issues. If left untreated, it can quickly spread and damage even the most well-maintained lawn.

Let’s break down how to spot it, why it happens, and what Dr. Green Services does to stop it.

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What Is Brown Patch Fungus?

Brown patch fungus is caused by a soil-borne pathogen called Rhizoctonia solani. This fungus thrives in warm, humid conditions and often becomes active from late spring through early fall. It commonly affects cool-season grasses like tall fescue and perennial ryegrass. However, it can also damage warm-season varieties like St. Augustinegrass.

Even healthy lawns can fall victim—especially when the weather is hot, the soil stays wet, or nitrogen levels are too high. Thick thatch, poor drainage, and overwatering all create the perfect environment for brown patch fungus to spread.

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Signs and Symptoms of Brown Patch Fungus

It’s not always easy to tell what’s wrong with your lawn, but brown patch fungus has some distinct signs:

• Circular or irregular brown patches

• A gray or dark “smoke ring” around the edge

• Affected areas that look wet or dewy early in the morning

• Grass blades with tan lesions and dark brown borders

These symptoms usually start small but can grow quickly. Some patches may stretch several feet across within just a few days.

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How Brown Patch Fungus Spreads

Unlike some lawn issues that stay in one spot, brown patch fungus can spread rapidly. It moves through infected grass clippings, foot traffic, lawn mowers, and other equipment. The fungus also survives in the soil and thatch, meaning it can return each year if conditions are right.

Too much moisture, especially when paired with excess nitrogen, creates an ideal breeding ground. Lawns watered late in the evening or fertilized incorrectly are particularly vulnerable. These patterns are explained in greater detail through lawn fungus science, which shows how moisture, temperature, and turf stress drive disease activity.

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How Dr. Green Services Controls Brown Patch Fungus

At Dr. Green Services, we don’t take a one-size-fits-all approach. Instead, we customize your treatment plan based on your lawn’s specific needs and your region’s climate.

Here’s how we tackle brown patch fungus:

• First, we evaluate your lawn’s current condition, looking closely at mowing height, thatch buildup, and watering habits.

• Next, we apply fungicides at the right time of year—before the disease spreads too far.

• We also adjust your fertilization schedule to avoid nitrogen overload, especially in humid months.

• Our certified technicians recommend liquid aeration, which improves air movement and reduces soil compaction.

• Finally, we help build lawn density over time. A thick lawn naturally resists disease and crowds out fungus.

We carefully time each service to reduce stress and protect your grass when it’s most vulnerable.

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Preventing Future Outbreaks of Brown Patch Fungus

Even after treatment, prevention is key. The good news? Many of these steps are simple:

• Water deeply but infrequently, and only in the early morning.

• Never water at night, as this allows moisture to sit on the grass for too long.

• Use sharp mower blades and avoid cutting more than one-third of the grass height at once.

• Don’t over-fertilize—especially not during hot, humid periods.

In some cases, Dr. Green Services may recommend including a fungicide as part of your broader lawn care service. This helps ensure long-term protection without damaging healthy turf.

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Why Trust Dr. Green Services?

With over 40 years of experience, Dr. Green Services is your go-to partner for managing fungus and maintaining a lawn you can be proud of. Our certified technicians use science-backed products and timing strategies that match your local weather and grass type.

You can also count on our added benefits, including:

• Free fungicide applications when needed

• Tailored seasonal treatments

• Expert advice on watering, mowing, and soil health

• A full guarantee for your peace of mind

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Ready to Protect Your Lawn?

If you’re noticing suspicious brown spots or just want to stay ahead of brown patch fungus, now is the time to act. Dr. Green Services offers professional lawn care programs designed to prevent, treat, and control lawn fungus before it gets out of hand.

Let us help you enhance your lawn and keep it looking its best—all season long. Get started today!