Dollar Spot in Bermuda Grass: DFW Identification and Treatment Guide

If you’ve noticed small, bleached circles scattered across your bermuda grass — each one roughly the size of a silver dollar — you’re almost certainly looking at dollar spot. It’s one of the most common fungal diseases on bermuda lawns in the DFW area, and it’s one that homeowners frequently misread as drought stress, fertilizer deficiency, or pest damage. Getting the diagnosis right matters, because the wrong response makes it worse. Our lawn disease and fungus control team has treated dollar spot on hundreds of bermuda lawns across Arlington, Grand Prairie, Mansfield, and the surrounding communities. Here’s what you need to know.

What Is Dollar Spot?

Dollar spot is a fungal disease caused by Clarireedia jacksonii (formerly classified as Sclerotinia homoeocarpa). It infects a wide range of turfgrasses but is particularly aggressive on bermuda grass, which is the dominant lawn grass across North Texas. The fungus overwinters in infected thatch and plant debris, then activates when temperature and moisture conditions align. It spreads from plant to plant through infected clippings, foot traffic, mowing equipment, and wind-dispersed mycelium.

Dollar spot is a shallow-feeding pathogen — it attacks the leaf blades and sheaths rather than the crown or root system. That means a lawn with dollar spot can recover fully if caught and treated early. Left unchecked through a long spring or fall season, however, the sheer number of coalescing spots can thin a bermuda stand significantly and allow weeds to fill in the gaps.

Why Bermuda Grass in DFW Is Vulnerable

Bermuda grass is the right choice for North Texas — it’s tough, heat-tolerant, and recovers quickly from stress. But it has one notable weakness: when it’s growing slowly or under nutrient stress, it becomes a very easy target for dollar spot. Several factors specific to the DFW climate make bermuda lawns here particularly susceptible:

• Warm days and cool nights in spring and fall: Dollar spot thrives when daytime temperatures run between 60°F and 85°F and nighttime temperatures drop enough to cause heavy dew formation. This is a perfect description of DFW conditions in April, May, October, and November. Extended dew periods keep leaf surfaces wet for hours each morning — ideal conditions for the fungus to spread.
• Drought stress during active growing season: Inconsistent irrigation that lets bermuda grass wilt between watering cycles weakens the plant’s ability to resist infection. Drought-stressed bermuda is far more susceptible to dollar spot than a well-watered lawn.
• Low nitrogen: Dollar spot is strongly linked to nitrogen deficiency. Bermuda grass with low fertility — especially lawns that weren’t fertilized properly through the growing season — shows dramatically higher disease pressure. Adequate nitrogen doesn’t prevent dollar spot entirely, but it significantly reduces severity and helps the lawn recover faster after treatment.
• Heavy thatch: Thatch buildup creates a reservoir for the pathogen to persist and reinfect year after year. Bermuda lawns that haven’t been dethatched or verticut in several years carry higher baseline dollar spot risk.
• Evening irrigation: Watering at night extends the leaf-wetness period into the early morning, giving the fungus maximum time to spread. This is one of the most controllable risk factors on any bermuda lawn.

How to Identify Dollar Spot

Dollar spot produces a very specific set of symptoms that, once you’ve seen them, are hard to confuse with anything else. Here’s what to look for:

• Silver-dollar-sized bleached spots: Individual infection centers are roughly 1 to 3 inches in diameter — about the size of a silver dollar, which is where the disease gets its name. The spots are tan to straw-colored and appear scattered across the lawn rather than in one large patch.
• Hourglass lesions on individual blades: This is the definitive identification marker. Pull a grass blade from the edge of an active spot and look closely. You’ll see a bleached or straw-colored band crossing the blade, with reddish-brown to tan borders on both sides of the lesion. The shape resembles an hourglass or a bow tie crossing the blade. No other common bermuda disease produces this exact lesion pattern.
• Cottony white mycelium in morning dew: During periods of high moisture and active infection, look at the turf early in the morning before dew dries off. Dollar spot produces a fine, white, cobweb-like mycelium that stretches across affected blades. It’s most visible in low-angle morning light and disappears quickly as the sun rises and dew evaporates. If you see this, the disease is actively spreading.
• Spots that merge into larger dead areas: Under heavy pressure, individual dollar spot circles run together and create irregular tan patches that can look like a different disease entirely. Once spots are coalescing, the infection has been active for some time.

Distinguishing Dollar Spot from Other Bermuda Diseases

Getting the right diagnosis before treating is critical. Dollar spot is most commonly confused with three other problems on DFW bermuda lawns:

• Brown patch: Brown patch creates large, roughly circular patches — often 1 to 3 feet or more in diameter — with a visible smoke-ring border at the active edge. It occurs when nighttime temperatures stay above 70°F with high humidity and excess moisture. Dollar spot spots are much smaller and do not show a smoke-ring border.
• Drought stress: Drought stress causes uniform, widespread thinning and discoloration across open, sun-exposed areas. Dollar spot produces distinct circular spots with the diagnostic hourglass blade lesion. Drought-stressed turf does not show individual blade lesions.
• Anthracnose: Anthracnose creates irregular tan patches under extreme heat stress and produces tiny black fruiting bodies (acervuli) on affected blades — visible under magnification. Dollar spot does not produce acervuli. The hourglass lesion and the cottony mycelium in morning dew are the markers that confirm dollar spot.

Treatment Steps for Dollar Spot

Once you’ve confirmed dollar spot, a two-track approach — cultural correction plus fungicide where needed — gives the fastest and most durable results:

• Apply a balanced nitrogen fertilizer: This is often the single most effective step for mild to moderate dollar spot. A light application of quick-release nitrogen — 0.5 to 1 pound of actual nitrogen per 1,000 square feet — boosts turf vigor and dramatically speeds recovery. Low-nitrogen bermuda stays sick far longer than well-fed bermuda. Do not skip this step even if you’re also applying fungicide.
• Shift irrigation to the morning: Move all watering to early morning (between 4 a.m. and 8 a.m.) so leaves dry quickly after sunrise. Eliminating evening watering is one of the most impactful changes you can make to reduce active spreading.
• Fungicide application with chemical class rotation: For moderate to severe cases, fungicides are necessary. DMI fungicides (propiconazole, myclobutanil) and SDHI fungicides (fluxapyroxad, penthiopyrad) both work well against dollar spot. The critical rule: never apply the same chemical class back-to-back. Dollar spot has a well-documented history of developing fungicide resistance when one product is used repeatedly. Rotate between chemical classes with each application. Most schedules run on 14 to 21-day intervals during active disease pressure.
• Remove excess thatch: If thatch is over half an inch thick, plan a dethatching or verticutting once the disease is under control. Reducing the thatch layer removes the pathogen reservoir and makes future outbreaks less severe.
• Mow regularly and clean equipment: Keep bermuda at its recommended height (typically 1 to 1.5 inches for home lawns). Mow frequently enough that you’re not removing more than one-third of the blade at a time. Clean mower decks and blades after mowing an infected area to avoid spreading spores to healthy turf.

Prevention Habits That Keep Dollar Spot Away

The homeowners we see with the least dollar spot trouble year after year all do a few things consistently:

• Fertilize on schedule: A proper bermuda fertilization program — starting in late spring when soil temperatures hit 65°F and running through late summer — keeps nitrogen levels where they need to be. Underfed bermuda is far more vulnerable every spring and fall when dollar spot conditions are prime.
• Water deeply and infrequently: One or two deep watering cycles per week (enough to wet the soil 4 to 6 inches down) is healthier than daily shallow irrigation. Deep watering encourages deep rooting and reduces the surface leaf-wetness that dollar spot needs to spread.
• Dethatch every two to three years: Regular dethatching or verticutting prevents the thatch layer from building up into a pathogen reservoir. Spring is the ideal window for bermuda in North Texas.
• Scout early in spring and fall: Walk your lawn on a cool morning during April or October and look for the early silver-dollar spots. Catching it in the first few circles is much easier — and cheaper — than treating 40 coalescing spots that have been spreading for three weeks.

For a closer look at another fungal disease that frequently appears alongside dollar spot on North Texas lawns in the summer, read our guide on Gray Leaf Spot in St. Augustine: Why Arlington Summers Make It Explode.