If you are battling stubborn grassy weeds in your lawn, you have likely come across mentions of MSMA. Over my 15 years in turf management, I have fielded this specific question hundreds of times from frustrated homeowners staring down a yard full of crabgrass or dallisgrass. It is an incredibly potent chemical, but its relationship with warm-season turf is highly specific and often misunderstood.
I have personally applied this herbicide on commercial sod farms in USDA Zone 8 and have seen exactly how different grass species react to it. Before you track down a bottle of this heavily regulated chemical, you need to understand exactly what it does to your lawn, why it works, and what the law actually allows.
Quick Answer
No, MSMA does not kill Bermuda grass. It is a highly selective post-emergent herbicide designed to destroy grassy weeds like crabgrass and dallisgrass while leaving Bermuda grass intact. Your Bermuda grass may temporarily turn yellow after application, but it will quickly recover. However, MSMA is currently banned by the EPA for residential lawn use and is only legal for specific commercial applications like golf courses and sod farms.
What Is MSMA? A Simple Explanation
MSMA stands for Monosodium methanearsonate. It is an arsenical, post-emergent herbicide that has been used for decades to control tough, invasive grassy weeds. A post-emergent herbicide means it targets weeds that have already sprouted and are actively growing above the soil.
Historically, this was the go-to cheap and highly effective weed killer for southern lawns. Because it contains organic arsenic, it works rapidly to burn down the foliage of targeted weeds.
Here is a quick breakdown of what this chemical actually is.
| Feature | Detail |
| Active Ingredient | Monosodium methanearsonate |
| Herbicide Type | Selective post-emergent |
| Target Weeds | Grassy weeds (crabgrass, dallisgrass, sandbur) |
This snapshot shows why the chemical is treated with such caution today. While highly effective, the active ingredient carries significant environmental persistence risks.
The History of the Residential Ban
You cannot walk into a big-box hardware store and buy this product anymore. In 2009, the Environmental Protection Agency (EPA) began phasing out the use of organic arsenical herbicides due to concerns about arsenic contaminating drinking water. By 2013, it was entirely illegal to apply it to residential lawns, parks, and school grounds.
How It Works
MSMA works through both contact and systemic action. When you spray it onto a weed, the chemical is absorbed directly through the leaf tissue. It quickly disrupts the plant’s cell membranes and interferes with ATP production, which is how the plant generates energy.
Within a few days of application, the targeted weed will begin to wilt, turn brown, and completely collapse.
Why Bermuda Grass Survives
The main difference between how a weed and Bermuda grass process this chemical comes down to metabolism. Bermuda grass has an incredibly aggressive growth habit, supported by deep rhizomes (underground stems) and stolons (above-ground runners).
When the herbicide hits Bermuda grass, the turf actively metabolizes and breaks down the chemical before it can reach the root system. The tips of the grass blades might suffer some chemical burn, but the core plant survives and pushes out new, healthy green growth within a week or two.
🌱 Beginner Note: A post-emergent herbicide only kills weeds you can currently see. It will not stop new weed seeds in the soil from germinating next month.
Key Benefits (For Allowed Commercial Use)
For the commercial sectors still legally permitted to use it, this herbicide remains a staple product. It is incredibly cost-effective compared to newer specialty herbicides.
It also works exceptionally fast. During the peak heat of summer, you can often see weeds curling and dying within 48 hours of spraying. Furthermore, it operates effectively in hot weather, unlike many other herbicides that vaporize or lose efficacy when temperatures climb above 85 degrees Fahrenheit.
The Ultimate Dallisgrass Solution
The primary reason professionals still rely on this chemical is dallisgrass. Dallisgrass is a perennial grassy weed that is notoriously difficult to kill. It grows in thick, ugly clumps that spread rapidly through warm-season lawns. Most standard weed killers simply do not phase it, but a targeted application of this arsenical herbicide will wipe it out completely.
When and Where It Is Used
Because of the severe environmental regulations, understanding where you can legally spray this product is critical. Applying it to a residential property is a violation of federal law and carries steep fines.
The EPA has strict guidelines on where this product can legally be applied today.
| Allowed Uses | Banned Uses |
| Golf courses (spot treatment only) | Residential lawns and gardens |
| Commercial sod farms | Public parks and playgrounds |
| Highway rights-of-way | School grounds and sports fields |
If your property does not fall into the allowed category, you cannot legally apply it. Homeowners must rely on safer, EPA-approved alternatives for their residential turf management.
Weeds MSMA Controls vs Grasses It Spares
Understanding selectivity is the most important part of applying any lawn chemical. Selectivity refers to an herbicide’s ability to kill specific unwanted plants while leaving the desired turfgrass completely unharmed.
While it spares your warm-season lawn, it aggressively targets specific invasive species.
| Target Weeds Killed | Safe Turfgrasses |
| Dallisgrass | Bermuda grass |
| Large and Smooth Crabgrass | Zoysia grass |
| Field Sandbur | Kentucky Bluegrass |
Dallisgrass remains the primary reason professionals reach for this bottle. It is worth noting that while it is safe for Zoysia and Kentucky Bluegrass, the application rates must be adjusted carefully, as these grasses are slightly more sensitive to chemical burn than Bermuda.
⚠️ Warning: Never apply this chemical to St. Augustine or Centipede grass. It lacks selectivity for these species and will severely damage or completely kill the turf.
My Experience With It
During my early years managing a commercial sod farm in USDA Zone 8, MSMA was our primary weapon against crabgrass and dallisgrass outbreaks. We grew hundreds of acres of hybrid Bermuda grass, and keeping the fields pristine was a constant battle.
I remember the first time I sprayed a heavily infested section of the farm. I applied the herbicide using a boom sprayer mounted on a tractor during a 90-degree July afternoon. Within three days, the dallisgrass had turned a crispy, dark purple-brown.
What surprised me most was the temporary shock to the Bermuda grass. The entire treated area took on a slightly yellow, sickly hue. I was terrified I had mixed the ratio incorrectly and burned an acre of valuable sod. However, a senior horticulturist assured me this was normal. After a good irrigation cycle and about eight days of recovery, the Bermuda grass pushed through completely dark green, entirely free of the weed competition.
Common Misconceptions
The biggest misconception I hear is that if a chemical turns your grass yellow, it is killing it. Signs of permanent damage include the grass pulling easily from the soil and the roots turning black. Temporary chlorosis (yellowing) is simply the grass pausing its growth to process the stress of the herbicide.
Another major misconception is that homeowners can still buy it through “secret” online channels. While some agricultural supply stores sell large jugs of it, purchasing it requires a commercial pesticide applicator’s license. Attempting to buy or use it without this credential is a serious legal risk.
💡 Pro Tip: If you notice your Bermuda grass yellowing after applying any selective herbicide, do not apply fertilizer immediately. Let the grass recover naturally for two weeks before pushing it with nitrogen.
Pros and Cons
Like any powerful tool in the shed, this chemical comes with a very distinct set of advantages and heavy drawbacks. It is not a miracle cure, and its environmental impact cannot be ignored.
Every chemical treatment comes with a unique set of trade-offs.
| Advantages | Disadvantages |
| Unmatched control of dallisgrass | Highly toxic active ingredient (arsenic) |
| Very fast-acting in hot weather | Illegal for residential use |
| Highly safe for Bermuda grass roots | Causes temporary yellowing of turf |
The environmental risks ultimately led to its restriction despite its high efficacy. As groundwater testing improved, the agricultural industry had to pivot away from arsenical compounds to protect local water tables.
Alternatives Worth Knowing
Since you cannot legally use MSMA on your home lawn, you need effective alternatives. The lawn care industry has developed several incredible residential-safe chemicals over the last decade. They might cost a bit more upfront, but they are highly effective and completely legal.
Since homeowners cannot use the original formula, the market has provided excellent substitutes.
| Alternative Herbicide | Best Used For | Safe on Bermuda? |
| Quinclorac | Crabgrass and foxtail | Yes |
| Celsius WG | Broadleaf weeds and sensitive lawns | Yes |
| Tribute Total | Dallisgrass and grassy weed suppression | Yes |
Quinclorac is usually the best starting point for most residential lawns. Let’s break down exactly how to use these alternatives effectively.
Quinclorac for Crabgrass
If your primary enemy is crabgrass, Quinclorac is your best friend. It is a highly effective post-emergent that targets crabgrass at almost every growth stage. You can buy it under various brand names, often mixed with other herbicides like 2,4-D to tackle broadleaf weeds simultaneously.
When applying Quinclorac, you must use a surfactant. A surfactant is a sticky liquid additive that helps the herbicide cling to the waxy leaves of the crabgrass. Without it, the chemical simply rolls off into the soil and is wasted.
Celsius WG for High Heat
One of the biggest challenges with treating weeds in Bermuda grass is the summer heat. Most herbicides, especially those containing 2,4-D, will severely burn your lawn if applied when temperatures exceed 85 degrees Fahrenheit.
Celsius WG is a premium, professional-grade herbicide that is safe to spray on Bermuda grass even when temperatures soar past 90 degrees. It is exceptional at killing broadleaf weeds like dollar weed, Virginia buttonweed, and spurge. While it is expensive upfront, a single bottle will easily last a homeowner several years.
Tribute Total for Dallisgrass
If you are dealing with dallisgrass—the weed that MSMA was famous for killing—your best legal residential option is Tribute Total.
Application Timing for Alternatives
To get the most out of your investment in these alternatives, you must apply them at the correct time of year.
Timing your post-emergent sprays dictates how successful your weed control will be.
| Season | Ideal Action | Herbicide Strategy |
| Spring | Catch early grassy weeds | Quinclorac spot treatments |
| Summer | Tackle heat-loving broadleafs | Celsius WG applications |
| Fall | Suppress perennial clumps | Tribute Total applications |
Spraying during the peak summer heat increases the risk of damaging your turf if you use the wrong product, so always verify the temperature limits on your chosen herbicide’s label.
FAQs
Q: Will MSMA kill my Zoysia grass?
A: No, it is generally safe for Zoysia grass, but Zoysia is more sensitive to it than Bermuda. It will likely cause more severe temporary yellowing on Zoysia. Regardless, it remains illegal for residential Zoysia lawns.
Q: How long does it take for Bermuda grass to recover from herbicide yellowing?
A: In my experience, healthy, actively growing Bermuda grass will typically recover from herbicide-induced chlorosis within 7 to 14 days, provided it is receiving adequate water.
Q: Can I use MSMA to kill weeds in my vegetable garden?
A: Absolutely not. It contains arsenic and is incredibly toxic. It should never be applied near edible crops, fruit trees, or vegetable gardens under any circumstances.
Q: What is the best way to prevent dallisgrass so I do not need strong chemicals?
A: The best way to prevent dallisgrass is to maintain a thick, densely growing Bermuda grass lawn. Mow at the correct height (1 to 1.5 inches), fertilize appropriately, and apply a pre-emergent herbicide in early spring and late fall to stop seeds from germinating.
Q: Does MSMA kill nutsedge?
A: It provides some suppression of yellow nutsedge, but it is not the most effective treatment. Products containing Halosulfuron-methyl (like Sedgehammer) are far superior for eradicating nutsedge in Bermuda grass.
Final Thoughts
The question of whether MSMA kills Bermuda grass reveals just how resilient this warm-season turf actually is. While Bermuda easily shrugs off this heavy-duty arsenical herbicide, the environmental realities mean homeowners must leave this chemical in the past.
As of the latest season I tested these products, the modern alternatives like Quinclorac and Celsius WG are more than capable of keeping your yard pristine. By focusing on proper lawn care fundamentals—like routine mowing, strict watering schedules, and timely pre-emergent applications—you can build a Bermuda lawn dense enough to choke out weeds before they ever have a chance to sprout. Save your money, stay on the right side of the EPA regulations, and use the modern, turf-safe chemicals designed for today’s residential lawns.
