Dallisgrass stands as one of the toughest grassy weeds to eliminate from a warm-season lawn. Its thick, clumping growth habit and aggressive root system allow it to choke out desirable turf, and most general-purpose weed killers barely slow it down. Finding a targeted solution requires understanding the specific active ingredients that actually penetrate this weed’s defenses.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I’ve spent years analyzing herbicide formulations, studying university extension reports on weed resistance, and cross-referencing thousands of owner experiences to identify which products deliver results on stubborn grasses like dallisgrass.
This guide breaks down the five most effective chemical and granular options available right now, explaining exactly how each one works and which lawn types they suit. If you need a clear, research-backed strategy for eliminating this pest, you’ve come to the right resource for choosing the best dallisgrass killer.
How To Choose The Best Dallisgrass Killer
Dallisgrass is a perennial grassy weed that thrives in compacted, poorly drained soil. Because its rhizomes and seed heads regenerate quickly, any control strategy must be both persistent and timed correctly. Here are the specific factors that separate a successful treatment from a wasted effort.
Selective vs. Non-Selective Active Ingredients
The first decision is whether you need a selective herbicide that spares your lawn or a non-selective product that kills everything it touches. Selective options such as mesotrione or quinclorac can target dallisgrass in Bermuda, Zoysia, or Fescue without damaging the turf. Glyphosate (non-selective) works only when applied directly to the weed in a spot treatment, and it will kill any grass it drips onto.
Pre-Emergent vs. Post-Emergent Timing
Pre-emergent products, like those containing dithiopyr or prodiamine, prevent dallisgrass seeds from germinating in spring. They do nothing to existing clumps. Post-emergent herbicides attack actively growing plants and are most effective when dallisgrass is young and vigorously growing, usually in late spring through early summer. Many professionals combine both approaches for season-long control.
Formulation: Liquid Concentrate vs. Granular
Liquid concentrates allow precise spot application and faster absorption through the leaf surface. Granular weed-and-feed products cover large areas uniformly but require moisture to activate and depend on the weed being small enough to absorb the chemical through its roots. For mature dallisgrass clumps, liquid spot treatment is almost always more reliable.
Quick Comparison
On smaller screens, swipe sideways to see the full table.
| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Liquid Harvest Mesotrione | Post-Emergent Liquid | Selective spot treatment on cool-season turf | 8 fluid oz. concentrate | Amazon |
| Control Solutions 82004318 | Non-Selective Liquid | Total vegetation kill in bare areas | 41% Glyphosate concentration | Amazon |
| Hi-Yield Turf & Ornamental | Pre-Emergent Granular | Preventing new dallisgrass seedlings | 12 lb. covers 5,000 sq. ft. | Amazon |
| GreenView Crabgrass Control Plus | Fertilizer + Pre-Emergent | Prevention combined with lawn feeding | 26-0-4 NPK, 13.5 lb. bag | Amazon |
| Scotts Turf Builder Weed & Feed5 | Post-Emergent Granular | Broadleaf weed control in established lawns | 11.32 lb. covers 4,000 sq. ft. | Amazon |
In‑Depth Reviews
1. Liquid Harvest Mesotrione – 8oz
Mesotrione is the standout selective active ingredient for dallisgrass control in cool-season lawns like Tall Fescue, Kentucky Bluegrass, and Perennial Ryegrass. This 8-ounce concentrate mixes with water to create a spot spray that targets 46 broadleaf and grass species, including crabgrass, barnyardgrass, and dallisgrass. The product inhibits photosynthesis in the weed, causing a whitening effect within days followed by full death within two to three weeks.
One critical detail is activation: mesotrione needs moisture within ten days of application, either from rainfall or from watering in with 0.15 inches of water. In hot, dry weather, skipping this step reduces efficacy significantly. The product is also safe on St. Augustine grass (sod only) and Centipede grass but should not be used on Bermudagrass, Zoysiagrass, or bentgrass during active growth unless you are applying to dormant turf.
Owners who follow the label rate and timing report excellent suppression of dallisgrass clumps without harming their desired turf. The bottle’s small size (8 oz) still provides substantial coverage because the dilution rate is low. For homeowners maintaining a mixed lawn with cool-season grass, this is the most targeted chemical tool available.
What works
- Selective — kills dallisgrass without harming many cool-season turf types
- Visible bleaching effect confirms absorption within days
- Includes pre-emergent action that prevents crabgrass seed germination
What doesn’t
- Requires watering-in or rain within 10 days for activation
- Not safe on actively growing Bermudagrass or Zoysiagrass
2. Control Solutions 82004318 1 Quart Eraser
When dallisgrass has taken over a patio crack, driveway edge, or a bare patch where no grass is wanted, a non-selective glyphosate concentrate is the fastest tool. This Control Solutions Eraser provides 41% glyphosate — one of the highest ready-to-mix concentrations available — in a low-odor, water-based formula. The quart size is economical for spot treating multiple clumps throughout a season.
Because glyphosate is non-selective, every green plant it touches will die. This makes it unsuitable for broadcast spraying over a lawn, but excellent for painting onto individual dallisgrass tufts with a sponge brush or a small handheld sprayer. The product becomes rainproof within a few hours, so timing around weather is less strict than with many selective herbicides. It also has no residual soil activity, meaning you can replant treated areas almost immediately after the visible dieback.
User reports consistently note that a single application to mature dallisgrass clumps often requires a follow-up treatment because the weed’s deep rhizomes can survive initial foliar kill. That said, the high concentration ensures faster wilting and regrowth suppression than lower-strength ready-to-use sprays. For bare-ground renovation projects, this is the reliable baseline.
What works
- High 41% glyphosate concentration for fast results on established weeds
- Rainproof in just a few hours
- No residual soil activity — plant immediately after dieback
What doesn’t
- Non-selective — kills any grass or plant it contacts
- Mature dallisgrass often needs repeat applications
3. Hi-Yield Turf & Ornamental Weed & Grass Stopper
Stopping dallisgrass before it germinates is a far easier battle than killing established clumps. Hi-Yield’s Turf & Ornamental Weed & Grass Stopper uses pre-emergent chemistry to create a chemical barrier in the soil that prevents dallisgrass seeds from rooting. A 12-pound bag covers 5,000 square feet, making it a strong choice for medium to large lawns.
The key advantage of this product is its extended application window — it can be applied up to four weeks later than many other pre-emergent crabgrass products, giving you flexibility if spring rains delay your schedule. It targets both annual grasses and broadleaf weeds, so it protects against multiple threats simultaneously. The granular form requires a standard broadcast spreader and should be watered in within a few days after application.
Keep in mind that pre-emergents maintain a barrier for a defined period. For full-season dallisgrass prevention, a split application (early spring followed by early summer) is recommended. Users who pair this with a post-emergent spot treatment later in the season report the cleanest lawns. This product is intended for established turf and ornamental beds, not for vegetable gardens or areas where you intend to reseed immediately.
What works
- Wider application timing than most pre-emergents
- Large 12 lb. bag covers 5,000 sq. ft.
- Also controls many broadleaf weeds
What doesn’t
- Only prevents new seeds — does not kill existing dallisgrass
- Requires watering-in and proper spreader calibration
4. GreenView Crabgrass Control Plus Lawn Food
GreenView’s 13.5-pound bag combines a pre-emergent herbicide with a 26-0-4 fertilizer, offering a two-in-one approach for homeowners who want to feed their lawn while putting down a protective barrier against grassy weeds. The NPK ratio provides a strong nitrogen boost that promotes spring green-up and deeper rooting, while the herbicide stops crabgrass and dallisgrass seeds from germinating.
The fertilizer component uses GreenSmart Enhanced Efficiency technology, which releases nitrogen steadily over about eight weeks. This reduces the risk of nutrient runoff and prevents the surge growth that often follows quick-release synthetic fertilizers. For lawns that need both feeding and weed prevention, this product eliminates an extra trip around the yard with the spreader.
The limitation, as with any pre-emergent, is that it offers zero control over existing dallisgrass clumps. Users with a clean lawn in early spring will see the best results. If you already have visible dallisgrass, you need to combine this with a post-emergent spot treatment. Some owners also note that the granular coverage is less precise on uneven terrain where spreader patterns overlap unevenly.
What works
- Dual-purpose — feeds and prevents weeds in one application
- Slow-release nitrogen feeds for up to 8 weeks
- Covers a generous 5,000 sq. ft.
What doesn’t
- Does not kill existing dallisgrass
- Granular spread pattern can be inconsistent on bumpy lawns
5. Scotts Turf Builder Weed & Feed5
Scotts Turf Builder Weed & Feed5 is a granular post-emergent product designed to kill over 50 listed broadleaf weeds while feeding the lawn. It works best when applied to a wet lawn during active weed growth, with daytime temperatures between 60°F and 90°F. The 11.32-pound bag covers 4,000 square feet and is formulated for use on Bahiagrass, Bermudagrass, Bluegrass, Centipedegrass, Fescue, Ryegrass, and Zoysiagrass.
For dallisgrass specifically, this product has a key limitation: it is optimized for broadleaf weeds (dandelion, clover, plantain) and its active chemistry does not reliably kill grassy weeds like dallisgrass. Many users find it effective against clover and dandelion but see minimal impact on dallisgrass clumps. Its real value is as a general lawn maintenance tool that reduces competition from broadleaf weeds, allowing the grass to thicken and crowd out dallisgrass over time.
The product should not be used on St. Augustinegrass (including Floratam), Dichondra, or Carpetgrass. For homeowners dealing with a mixed weed population that includes both broadleaf invaders and grassy dallisgrass, this product handles the broadleaf side but needs a companion product — like a mesotrione spot spray — to tackle the dallisgrass directly.
What works
- Controls 50+ broadleaf weeds effectively
- Combines feeding and weed control in a single spreader pass
- Safe on most common warm- and cool-season grasses
What doesn’t
- Not effective against grassy weeds like dallisgrass
- Cannot be used on St. Augustinegrass or Carpetgrass
Hardware & Specs Guide
Active Ingredient Concentration
The percentage of the killing agent in the bottle or bag dictates how much product you need per gallon of water or per thousand square feet. For non-selective sprays, 41% glyphosate is the standard for heavy jobs. Selective liquids like mesotrione are effective at 4% concentration because they work through a different biochemical pathway. Always check the label concentration — lower percentages may require more frequent reapplication.
Coverage Area
Granular products list a coverage area in square feet (e.g., 5,000 sq. ft. for a 13.5 lb. bag). Liquid concentrates list the volume of concentrate you mix, and the coverage depends on your dilution ratio. A 1-quart bottle of 41% glyphosate mixed at 2 ounces per gallon covers roughly 1,000 to 2,000 square feet of dense vegetation. Matching the coverage to your lawn size prevents underdosing.
FAQ
How long does it take for mesotrione to kill dallisgrass?
Can I use glyphosate on dallisgrass in my lawn without killing the grass?
Final Thoughts: The Verdict
For most homeowners, the best dallisgrass killer winner is the Liquid Harvest Mesotrione because it provides selective post-emergent control that spares cool-season turf while effectively eliminating established dallisgrass and preventing new crabgrass germination. If you need a non-selective solution for bare-ground renovation, grab the Control Solutions Eraser. And for a preventative barrier that also feeds your lawn, nothing beats the Hi-Yield Turf & Ornamental Weed Stopper.