Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
That brown patch spreading across your lawn, the powdery film on your blades, the sudden rings of yellow that turn your pride into a worry — those are the signs a fungus has moved in. The right cure starts with the right active ingredient, not a marketing claim. This guide cuts past the shelf confusion to nine proven fungus fighters, ranked by what matters: effectiveness, coverage, and real-world results from thousands of lawns just like yours.
I’m Rikta — the founder and writer behind Lawn Gear Lab. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
If you want to stop the damage and bring back a healthy green lawn without wasting money on the wrong bottle, you need to understand how each formula works. Here is your complete breakdown of the best grass fungus killer options available right now.
Our Picks at a Glance
How To Choose The Best Grass Fungus Killer
Walking the fungicide aisle can feel overwhelming when every bottle promises to save your lawn. The shortcut is to look past the flashy labels and check the active ingredient first — that is the actual chemistry doing the work. Two ingredients dominate the home-lawn world: propiconazole, a broad-spectrum system that moves through the plant to stop disease from the inside, and myclobutanil, which acts both as a cure and a shield for over 38 different fungi.
Liquid Concentrate vs Granular
Liquid concentrates (like the majority of picks on this list) must be mixed with water and applied with a sprayer, giving you precise spot-treatment on affected areas. Granular options, by contrast, are spread like fertilizer and work best as a preventive broadcast over a large lawn. The choice depends on whether you already see fungus (reach for a liquid) or just want to keep the yard clear through the wet season (granules shine here).
Resistance Management
Fungus can adapt to a single active ingredient if you use it exclusively. That is why the review pages consistently recommend rotating between different modes of action — for example, using a propiconazole treatment one season and a myclobutanil product the next. This simple habit keeps the chemistry effective year after year.
Quick Comparison
| Model | Best For | Active Ingredient | Volume/Weight | Coverage | Amazon |
|---|---|---|---|---|---|
| Quali-Pro Propiconazole 14.4★ Best Overall | Broad-spectrum disease control | Propiconazole 14.3% | 32 fl oz | Varied by rate | Amazon |
| Ferti-lome Liquid Systemic IIRapid Curative | Quick curative action | Propiconazole | 32 fl oz | Varied by rate | Amazon |
| Select Source Propiconazole 14.3Smart Budget | Value-priced concentrate | Propiconazole 14.3% | 16 fl oz | Varied by rate | Amazon |
| Monterey Fungi-Max | Systemic action with easy measuring | Propiconazole | 16 fl oz | Varied by rate | Amazon |
| Atticus Gravex 20EW | Cure + prevent in one spray | Myclobutanil 19.7% | 19.21 fl oz | Varied by rate | Amazon |
| Atticus Gunner 14.3 MEC (32oz) | Large-volume flexible application | Propiconazole 14.3% | 32 fl oz | Varied by rate | Amazon |
| Jonathan Green Lawn Fungus Control | Granular preventive for large lawns | Broad-spectrum blend | 22.5 lbs | 15,000 sq ft | Amazon |
| The Andersons Prophesy DG | Professional-grade granular fungicide | Propiconazole | 25 lbs | Up to 10,000 sq ft | Amazon |
In‑Depth Reviews
1. Quali-Pro 83013366 Propiconazole 14.4 Fungicide, 32oz
Our pick — over 4.5★ from 850+ verified ratings; the strongest balance of quality and price.
The crowd-trusted cure that stops brown patch in its tracks, with a bottle that lasts seasons.
This is the liquid heavy-hitter for any homeowner tired of watching fungus creep across the yard. It uses a microemulsion formulation — meaning very fine particles that mix easily and stick to every blade — so the 14.3% propiconazole gets absorbed quickly through leaves and roots. The trade-off in size is clear against the Select Source option: at 32 fluid ounces it offers double the volume of a 16-ounce bottle, while the concentrate itself weighs about 2 pounds versus 1.37 pounds.
Versatility is another strong point: the same bottle handles trees, shrubs, and flowers, so you are not buying separate products for different parts of the landscape. It works with hose-end sprayers, pump sprayers, or backpack rigs, and the systemic action keeps protecting for weeks after application.
What owners love most
- Broad-spectrum control covering rust, brown patch, dollar spot, and more
- Low-odor microemulsion is comfortable to mix and apply
- Excellent value — most users report a single bottle lasts 4-5 years
A fair caution
- Avoid applying in extreme heat to prevent stressing the grass
- Requires full PPE (gloves, long sleeves) for safe handling
Your best choice if: you want one product that handles almost every lawn disease, backed by nearly 900 reviews and a 4.6-star consensus.
Think twice if: you prefer a ready-to-spread granular for a quick broadcast — stick to the Jonathan Green or Andersons picks below.
2. Fertilome (11378) Liquid Systemic Fungicide II Concentrate, 32 oz
The budget-friendly propiconazole that delivers visible results in as little as three days.
This 32-ounce concentrate is a near-perfect match to the Quali-Pro above in volume (both 32 oz) and weight (both about 2 pounds), but it lands at a noticeably more accessible price point. The active ingredient is propiconazole, and the formula targets the most common lawn diseases you will encounter: Take All Patch, Brown Patch, Dollar Spot, and Leaf Spot. It mixes readily with water, and a 4-ounce-per-gallon rate is the common starting point for turf applications.
The stand-out here is speed. While many systemic fungicides take a week or more to show change, buyers report they “saw results within three days and continue to use this year after year.” That quick visual feedback is invaluable when you are watching a fungus spread and need to know the treatment is working. The 32-ounce bottle provides multiple treatments across a season, and the liquid format lets you spot-spray affected areas without blanketing the whole lawn.
One thing to note: the label lists target species as “Insects,” which is a data anomaly — the product’s own description confirms it is a fungicide for controlling fungal diseases. For severe infestations of powdery mildew or rust, multiple applications may be needed, but the price per treatment is low enough to make that practical.
Why it earns a spot
- Fast visible results — owners mention clear improvement within days
- Generous 32-ounce bottle covers many treatments across the season
- Affordable entry point for a proven propiconazole systemic fungicide
What to watch for
- Severe cases may need a second application for full control
- Best applied early in the growing season for preventive results
Grab this if: you need a fast-acting liquid that stops yellowing and fungus spread quickly, at a cost that makes repeat treatments painless.
skip it if: you want a low-odor formulation — this one does not highlight the microemulsion low-smell feature of the Quali-Pro or Atticus Gunner options.
3. Select Source Propiconazole 14.3 Pint Select Fungicide
A pint of targeted power that punches above its size for the smaller-lawn owner.
At 16 fluid ounces, this is half the volume of the Quali-Pro (32 oz) and noticeably lighter at roughly 1.37 pounds compared to 2 pounds. But do not let the smaller bottle fool you — the 14.3% propiconazole concentration is the same professional-grade active used on golf courses and in landscaping. The difference is that this pint is perfect for the homeowner with a modest yard who does not want to store a large bottle for years. As the review pages sum it up: “Great product which removes the fungus from your grass.”
The low odor formulation is a recurring positive — no harsh chemical smell during mixing or application. It also boasts high tank mix compatibility, meaning you can combine it with other products like azoxystrobin for a broader defense. Owners who rotate their fungicides often pair this with a second active ingredient, applying one every two weeks for season-long protection. The EPA-registered formula gives confidence that it meets federal standards for turf use.
If you have a Bermuda or fescue lawn and spot the first signs of fungus, this pint is an economical first-aid kit that gets the job done without the waste of a larger container.
The strong points
- Concentrated 14.3% propiconazole at a budget-friendly price point
- Low-odor formula and easy mixing with a pump-up sprayer
- High tank-mix compatibility for resistance management
The one caveat
- Storage note: keep the bottle in a cool place; the pint size is small enough to tuck away easily
Perfect for: a targeted treatment on a smaller lawn (under 5,000 sq ft) where a full quart would be overkill.
Look elsewhere if: you have a large property needing multiple applications — the 32-ounce options above will save you from reordering mid-season.
4. Monterey Fungi-Max Fungicide, 16 oz with Measuring Spoon
A systemic fungicide that covers your whole garden — lawn, roses, fruit trees, and vegetables — in one bottle.
This is the most versatile pick on the list because it is labeled for outdoor use on lawns, roses, flowers, ornamentals, shrubs, trees, fruit and nut trees, berries, and vegetables. One application protects plants for up to two weeks. The active ingredient is a systemic propiconazole, and the 16-ounce bottle comes with a measuring spoon — a small but welcome convenience that eliminates guesswork when mixing small batches.
Owner reports highlight its effectiveness on rust fungus on hawthorn bushes, powdery mildew on roses, and fungus outbreaks on St. Augustine lawns. As one owner notes: “You use a very small amount per gallon, so you get a lot of applications from it.” That economy is real — a single bottle can stretch across many treatments if you are spot-spraying. For lawn-specific problems like brown patch, dollar spot, and red thread, it works just as well as the more specialized turf products.
The only limitation is the 2-week protection window, which is shorter than the 28-day coverage some propiconazole options offer. That means slightly more frequent reapplication during peak disease season.
Where it wins
- Labeled for lawns, ornamentals, fruit trees, and vegetables — one bottle for the whole yard
- Comes with a measuring spoon for easy, precise mixing
- Highly concentrated — a small amount per gallon goes a long way
The trade-off
- Protection lasts up to 2 weeks, so you may need to spray more often than with longer-lasting options
Reach for this if: you have a mix of lawn, garden beds, and fruit trees and want a single fungicide for all of them.
pass on it if: you only need a lawn-specific treatment and prefer the longer residual of the Atticus Gunner or Quali-Pro picks.
5. Atticus Gravex 20EW Fungicide (16 oz) – Myclobutanil 19.7%
If you have been using propiconazole products for a while and suspect resistance building up, this is your rotation partner. Gravex 20EW contains 19.7% myclobutanil, the same active ingredient as the professional Eagle 20EW. It works two ways: it cures an active outbreak and simultaneously prevents future development on new growth. The upward systemic mobility means it moves inside the plant to protect tender new leaves as they emerge, for up to 28 days of protection.
The control spectrum is broad — more than 38 plant fungi including brown patch, dollar spot, red thread, spring dead spot, anthracnose, powdery mildew, scab, and black spot. It is approved for turf, over 100 ornamental plants, and residential fruit trees. Owners praise it for quickly clearing powdery mildew on zinnias and tackling brown rot on peaches. The strong odor does get mentioned as a downside, so be prepared for that during mixing.
Use it early in the season as a preventive or at the first sign of disease. The measuring spout on the bottle makes pouring accurate amounts simple with a garden tank sprayer. Not available in Alaska, DC, New York, Puerto Rico, or Vermont.
Why choose this
- Both curative and preventive — stops existing disease and blocks new growth
- Protects new foliage via upward systemic movement for up to 28 days
- Ideal fungicide to rotate with propiconazole for resistance management
Honest note
- The odor is stronger than propiconazole options — mix outdoors or in a well-ventilated area
Get this for: a strategic rotation that adds a different mode of action to your disease-control plan.
Not for you if: you are sensitive to chemical odors during mixing — stick with the low-odor propiconazole formulas.
6. Atticus Gunner 14.3 MEC Propiconazole Fungicide (32 OZ)
The same MEC rain-fast formula as the 16oz version, but in a quart bottle built for bigger lawns.
This is the logical upgrade if you found the 16-ounce Atticus Gunner above but need more volume. At 32 fluid ounces, it holds the same 14.3% propiconazole in the same microemulsion concentrate that resists rain wash-off. The MEC technology means the particles stay suspended in your tank without settling, and the formula is tank-mix compatible with other fungicides if you want to layer modes of action.
Low odor is a consistent theme in owner feedback — this is not a product that will stink up your garage after mixing. Protection lasts up to 28 days per application, and the formula enters the plant quickly through root uptake and stem absorption. Owners who treat their lawns preventatively in early summer find this quart gives them enough concentrate for the entire season, especially if they are rotating with a granular azoxystrobin product.
Why it stands out
- Full quart of MEC concentrate — enough for multiple full-lawn treatments
- Rain-fast once dried; stays effective through unexpected weather
- Low-odor mixing and application, no lingering chemical smell
The fine print
- Requires thorough mixing for best results, as some owners note
- Not for sale in several states — verify availability before purchase
Pick this for: a large lawn (say, over 7,500 sq ft) where the 16oz bottle would run out mid-season.
Go smaller if: your yard is under 3,000 sq ft — the 16oz version will last you two seasons or more.
7. Jonathan Green (10236) Lawn Fungus Control – Fungicide for Lawns (15,000 Sq. Ft.)
A granular broadcast that covers up to 15,000 square feet — the easy-way-out for large-lot owners.
This is the one granular option on the list that changes the game for anyone tired of mixing liquids and spraying. The 22.5-pound bag covers up to 15,000 square feet — nearly a third of an acre — and you simply walk behind your spreader. It works on both cool and warm-season grasses, controls over 20 soil-borne diseases including brown patch, leaf spot, red thread, dollar spot, and pink snow mold.
The key distinction from liquid systemics: this is both a preventive and a treatment, but it will not repair the damage that has already happened. Use it at the first sign of disease or as a spring preventive. Owners who rotate fungicides find this a perfect partner to liquid propiconazole — use the spray mid-season and the granules for a spring and fall broadcast. The label says it can be used at the same time as seeding a new lawn, which is a rare convenience.
A handful of bags have arrived with hard lumps that clogged spreaders, which is a quality-control frustration worth noting. The consensus, though, is that when the product is in good condition, it works quickly — one owner reported that their Zoysia lawn “has never looked better” after treatment.
The upside
- Enormous coverage — 15,000 sq ft from one bag, at a reasonable per-treatment cost
- Granular format means no measuring, no mixing, no sprayer cleanup
- Works on all grass types and can be applied alongside seeding
The catch
- Occasional bag quality issues with hard lumps that require breaking apart
- Will not reverse existing damage — use it preventively or early
Grab this for: a no-spray, spread-and-go preventive program on a large lawn where you value convenience over spot-treatment precision.
it’s not for you if: you have an active outbreak right now — a liquid systemic will stop the spread faster than granules.
8. The Andersons Prophesy Propiconazole Broad Spectrum Fungicide on DG Pro, 25lbs
The granular powerhouse that cured necrotic ring spot when nothing else would — professional-grade in a homeowner-friendly bag.
This is the heavy artillery. The Andersons Prophesy uses patented DG Technology — a dispersible granule that breaks apart into more particles per square foot than standard granules, giving you superior coverage and consistency. The 25-pound bag covers up to 10,000 square feet with a systemic propiconazole that both prevents and cures diseases like brown patch, dollar spot, and snow mold.
The review pages tell a remarkable story: customers note that this product succeeded where other fungicides failed, specifically against necrotic ring spot — a particularly stubborn disease that kept getting worse despite other treatments. One owner noted they previously paid double at a local nursery for the same type of product. The DG Pro technology means you spread it with a standard lawn spreader, and the granules dissolve when watered in, releasing the active ingredient into the root zone for systemic uptake.
Value for money is a mixed topic among owners — the upfront cost is higher than other options, but the professional-grade results and the fact that it often replaces multiple weaker treatments make it worthwhile for serious lawn enthusiasts. Requires precise spreader calibration (lbs per 1000 sq ft) for best results.
What justifies the price
- DG Technology provides more particles per square foot for even distribution
- Stopped necrotic ring spot when other products could not — proven results
- Systemic propiconazole in an easy granular format, no sprayer needed
One honest thing
- The upfront cost is higher than most options; consider it an investment in a severe or recurring fungus problem
Reach for this if: you have a stubborn fungus that has resisted other treatments, or you want a professional-grade preventive for a prized lawn.
Stick with liquids if: you prefer spot-treating small affected areas rather than broadcasting granules over the whole yard.
Understanding the Specs
Propiconazole vs Myclobutanil
Liquid Concentrate vs Granular Broadcast
Liquid concentrates (like the Quali-Pro, Fertilome, and Atticus options) must be mixed with water and applied with a sprayer. They offer precise targeting — you can treat only the infected patches without covering the whole lawn. Granular fungicides (like the Jonathan Green and The Andersons picks) are spread with a standard fertilizer spreader. They are more convenient for large areas and work well as preventive treatments, but they cannot spot-treat as precisely. For an active outbreak, liquids typically deliver faster visible results.
FAQ
How long does it take for a grass fungicide to work?
Can I use a grass fungus killer on my vegetable garden or flowers?
What is the difference between a preventive and a curative fungicide?
How often should I apply fungicide to my lawn?
Can I mix two different fungicides together in my sprayer?
Will a grass fungus killer work on all grass types?
How do I know if my lawn has fungus or just needs water?
Can I seed my lawn after applying a fungicide?
What happens if I apply too much fungicide?
Is it safe to walk on the lawn after applying a liquid fungicide?
Final Thoughts: The Verdict
For most people, the best grass fungus killer winner is the Quali-Pro Propiconazole 14.4 Fungicide because it combines the highest concentration of propiconazole in a generous 32-ounce bottle, with a low-odor microemulsion that owners trust season after season against brown patch, dollar spot, and more. If you want a fast-acting liquid that shows visible results in days, grab the Ferti-lome Liquid Systemic II. And for large-lot owners who prefer spreading granules over mixing sprays, the Jonathan Green granular covers up to 15,000 square feet with no measuring required.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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