Best Antifungal For St Augustine Grass: 10 Lawn Fungicides Compared

#1 · Best Overall

1. Scotts DiseaseEx Lawn Fungicide

• Weight: 10 lb
• Form: Patch

Best for: Broad lawn-disease coverage.

Why it ranks #1: Its listed coverage specifically includes brown patch among 26 lawn diseases, and the product is described for prevention and control at early symptoms.

Scotts DiseaseEx lists control of 26 lawn diseases, including brown patch, red thread, rust, and powdery mildew. That named breadth gives St. Augustine owners a single granular option to consider when several familiar lawn diseases are concerns, with use permitted both before disease appears and at its first symptoms.

Its prevention-and-control positioning supports two stages of a lawn-care plan: application before disease appears or treatment when symptoms first show. The 26 listed diseases include brown patch, a relevant named target for St. Augustine lawns, as well as red thread and powdery mildew. The 10-pound package is a granular lawn product, so buyers can select it for a granular application workflow; the supplied facts do not specify a spreader or application rate.

Skip it if you need a hose-end spray application; Spectracide Immunox offers a QuickFlip hose-end sprayer and listed lawn-disease control.

A fit for St. Augustine owners seeking a granular product with named coverage that includes brown patch and options for preventive or early-symptom use. Follow the label and keep people and pets out of the treated area after application.

Listed on Amazon as: Scotts DiseaseEx Lawn Fungicide, 10 lbs.

#2 · Best Brown Patch Liquid

2. Atticus Gunner Propiconazole

• Weight: 2 lb
• Form: Liquid

Best for: Mixable propiconazole concentrate.

Why it ranks #2: This 14.3% propiconazole liquid explicitly lists brown patch among 20-plus diseases and describes an easy-mix microemulsion concentrate.

Gunner 14.3 MEC uses a microemulsion concentrate formulation that the listing says makes mixing easier and improves product stability. Its 14.3% propiconazole active ingredient and stated protection against more than 20 plant fungi make this liquid concentrate a candidate for lawn owners comfortable preparing a mix.

The listing identifies brown patch and leaf spot among the diseases addressed, connecting its broad-spectrum claim to two named lawn concerns. MEC means microemulsion concentrate; the manufacturer says its extremely small particles support easier mixing and greater product stability, which may simplify preparing the liquid for use. The 32-ounce bottle is supplied as one bottle, and the listing also describes the formula as low-odor. Follow the product label for application directions.

Skip it if you want granular treatment without mixing; The Andersons Prophesy uses dispersing granules and lists broad-spectrum lawn disease control.

A fit for St. Augustine owners seeking a propiconazole liquid concentrate with named brown-patch coverage and an easier-mixing formulation. Choose another format if measuring and preparing liquid applications does not suit your lawn-care routine.

Listed on Amazon as: Atticus Gunner 14.3 MEC Propiconazole Fungicide (32oz) – Protect Your Lawn

#3 · Broad-Spectrum Liquid

3. Atticus Artavia Azoxystrobin

• Weight: 1.3 lb
• Form: Liquid

Best for: Broad-spectrum azoxystrobin concentrate.

Why it ranks #3: Its 22.9% azoxystrobin formula is described as controlling more than 20 turf diseases, with leaf-to-root movement and liquid application.

Artavia 2 SC contains 22.9% azoxystrobin, which the listing says moves within the plant to provide root-to-leaf protection. It is described as controlling more than 20 turf fungi, including anthracnose and leaf spot, making it a broad-spectrum liquid option for lawn and landscape use.

The stated movement within the plant connects the active ingredient to the product's leaf-to-root protection claim, rather than limiting its description to surface coverage. Its listed turf scope covers more than 20 fungi, with anthracnose and leaf spot named as examples; the listing also gives a broader ornamental-plant disease count. The 16-ounce bottle is a liquid concentrate, so buyers should account for measuring and mixing rather than expecting a ready-to-use spray. Follow label directions.

Skip it if you want granules instead of liquid mixing; Scotts DiseaseEx is a granular lawn fungicide with brown patch among 26 listed diseases.

A fit for lawn owners looking for a liquid azoxystrobin concentrate with named turf-disease coverage and stated root-to-leaf movement. Its concentrated format is better suited to buyers prepared to measure and mix applications.

Listed on Amazon as: Atticus Artavia 2 SC Azoxystrobin Fungicide (16oz) – Broad Spectrum Control

#4 · Large-Area Granules

4. The Andersons Prophesy Granules

• Weight: 25 lb
• Form: Granules

Best for: Granular preventive applications.

Why it ranks #4: The 25-pound propiconazole granule listing covers up to 10,000 square feet and describes both preventative and curative use.

Prophesy uses Dispersing Granule technology: its particles break into smaller microparticles on contact with water, which the listing says provides better coverage. This 25-pound granular fungicide is positioned primarily for prevention, while also being described for curative or rescue use after disease appears.

The water-activated particle dispersal connects the granule format to the stated coverage benefit, a practical point for buyers planning a lawn application. Prophesy is described as most efficient as a preventive treatment, but the listing also identifies curative and rescue use to help eliminate disease after it appears. Its 25-pound package is stated to cover up to 10,000 square feet. Directions specify applying after mowing, so mowing needs to precede treatment.

Skip it if you cannot apply after mowing; Liquid Harvest Broad Spectrum Disease Control is a liquid option with preventive and curative use listed.

Consider Prophesy if you want a large granular package and can schedule treatment after mowing. Its preventive emphasis and stated rescue use offer flexibility, but the mowing instruction matters when planning an application window.

Listed on Amazon as: The Andersons Prophesy Propiconazole Broad Spectrum Fungicide on DG Pro, 25lbs (up to 10,000 sq ft.)

#5

5. Liquid Harvest Disease Control

• Weight: 2.5 lb
• Form: liquid

Best for: Self-measuring propiconazole bottle.

Why it ranks #5: Its 14.3% propiconazole liquid is labeled for turf and lists several lawn diseases, including gray leaf spot, red thread, and summer patch.

Liquid Harvest includes a self-measuring bottle with its 14.3% propiconazole fungicide, giving buyers a built-in aid for dosing the liquid concentrate. The listing describes systemic preventive and curative control for turf and names powdery mildew, red thread, gray leaf spot, and other disease targets.

The self-measuring bottle supports the listed dosing workflow, which ranges from 0.5 to 4 fluid ounces per gallon per 1,000 square feet; users are directed to consult the label for the specific dose. Its 14.3% propiconazole formula is described as systemic and suitable for preventive and curative control. Named targets include powdery mildew, red thread, gray leaf spot, summer patch, and snow mold, helping buyers check whether a listed concern matches.

Skip it if you want ready-to-spray hose-end use; Spectracide Immunox includes a QuickFlip hose-end sprayer and lawn-disease control.

A fit for St. Augustine owners who want named disease targets and a self-measuring liquid bottle. The dose range depends on label directions, so it suits buyers willing to check the specified rate for their application.

Listed on Amazon as: Liquid Harvest Broad Spectrum Disease Control – 32 Ounces – 14.3% Propiconazole Fungicide for Turf, Ornamentals & Plants – Effective Against Powdery Mildew, Rust, Leaf Spot & More for Healthier Plants

#6

6. BioAdvanced Fungus Control

• Weight: 10 lb
• Form: Granules

Best for: Rain-and-watering exposure.

Why it ranks #6: This 10-pound granular lawn fungicide is a straightforward lawn-specific option, though the supplied listing does not detail active ingredients or target diseases.

BioAdvanced's listing highlights that its lawn fungus control will not wash away due to rain or watering, a useful distinction for buyers managing treatment around wet conditions. The 10-pound product comes as granules, giving lawn owners a granular format rather than a ready-to-spray hose-end application.

The stated rain-and-watering resistance can help buyers plan treatment without relying on dry weather to keep the product from washing away, according to the listing. Its granular form and 10-pound package identify the application format and quantity, though the supplied facts do not name specific diseases or provide an application rate. The instructions do call for protective clothing during application and handwashing afterward, so handling precautions belong in the workflow.

Skip it if you need a named brown-patch target; Scotts DiseaseEx lists brown patch among its 26 lawn diseases.

Consider this for buyers who value the listed resistance to rain or watering and prefer granules. Its supplied details do not identify disease targets, so it is a less specific match when choosing treatment for a named St. Augustine problem.

Listed on Amazon as: BioAdvanced Fungus Control for Lawns, Granules, 10 lb, Fungicide for Lawns

#7

7. Bonide Infuse Granules

• Weight: 7.5 lb
• Form: Granules

Best for: Systemic lawn and landscape granules.

Why it ranks #7: The 7.5-pound systemic granules claim control of more than 30 plant diseases and describe use on lawns, but list no specific St. Augustine disease.

Bonide Infuse is described as systemic disease control for lawns and landscapes, with control of more than 30 plant diseases. Its granular form and listed use across lawns, annual and perennial flowers, and foliage plants make it a multi-setting option for buyers managing more than turf alone.

The systemic, broad-spectrum description includes soil-borne disease control, extending the stated use beyond a lawn-only disease profile. The listing says it controls over 30 plant diseases and can be used on lawns as well as annual and perennial flowers and foliage plants. Its 7.5-pound package is granular, giving buyers a solid-product format for these settings. The supplied safety information directs users to follow label instructions, which should guide application and permitted uses.

Skip it if you need a named brown-patch target; Scotts DiseaseEx explicitly lists brown patch among its controlled lawn diseases.

A fit for buyers seeking systemic granules for lawns and several landscape plant types, with a stated disease count above 30. Check the label for the specific lawn disease and application directions relevant to your St. Augustine.

Listed on Amazon as: Bonide Infuse Lawn & Landscape Systemic Disease Control, 7.5 lb.

#8 · Hose-End Spray

8. Spectracide Immunox Spray

• Weight: 2.4 lb
• Form: Spray

Best for: Hose-end disease and insect control.

Why it ranks #8: Its ready-to-spray hose-end format controls listed lawn diseases and insects; the listing recommends starting when grass greens and treating every two weeks.

Spectracide Immunox combines lawn-disease control with contact control of listed lawn-damaging insects in one dual-action formula. Its QuickFlip hose-end sprayer attaches to a garden hose and activates at a switch flip, letting buyers apply the ready-to-spray product without mixing a concentrate.

The hose-end sprayer simplifies application by connecting directly to a garden hose, while the dual-action formula addresses listed lawn diseases and lawn-damaging insects on contact. The product is described as rainproof in hours, a useful detail for planning around subsequent rain. For disease prevention, the listing says to begin when grass starts greening in spring and treat every two weeks for best results, so the schedule requires recurring attention.

Skip it if you prefer a granular preventive with no hose connection; The Andersons Prophesy is a granular option described as most efficient preventively.

A fit for St. Augustine owners who want hose-end application and combined listed insect and disease control. Its spring-start, every-two-weeks guidance suits buyers willing to maintain a recurring treatment schedule.

Listed on Amazon as: Spectracide Immunox Fungus Plus Insect Control for Lawns, 32 oz

#9

9. Lebanon PPZ Granules

• Weight: 25 lb
• Form: Granule

Best for: Large granular propiconazole package.

Why it ranks #9: This 25-pound propiconazole lawn-fungicide granule listing fits the turf category, but supplies no target-disease or application details.

Lebanon PPZ 0.72G is identified as a propiconazole lawn fungicide in a 25-pound granular package. That combination gives buyers a clearly stated active-ingredient designation and bulk granule format, though the supplied information does not name particular disease targets or treatment directions.

The granular form and 25-pound package distinguish this product from small-bottle liquid concentrates and may suit buyers selecting a bulk lawn-treatment format. Its title identifies PPZ 0.72G and propiconazole, while the supplied specifications confirm LebanonTurf as the brand and granules as the item form. No disease spectrum or application rate is supplied here, so buyers cannot use these details alone to match it to a specific St. Augustine disease.

Skip it if you need listed brown-patch coverage; Scotts DiseaseEx names brown patch among its 26 controlled lawn diseases.

A possible fit for buyers specifically seeking a large granular propiconazole product. The package is substantial, and the supplied details do not name disease targets, so check the label before choosing it for St. Augustine.

Listed on Amazon as: Lebanon PPZ 0.72G Propiconazole Fungicide, Lawn Fungicide, 25 lb Bag

#10

10. Quali-Pro Propiconazole Fungicide

• Weight: 2 lb
• Form: Oil

Best for: Propiconazole oil-form option.

Why it ranks #10: The listing identifies a 14.4 propiconazole fungicide in a 32-ounce oil form, but provides no lawn-specific disease or use details.

Quali-Pro's product is identified as a 14.4 propiconazole fungicide in a 32-ounce bottle, offering buyers a named active ingredient and liquid oil form. The supplied listing is brief, so its supported appeal is the clearly stated formulation and bottle size rather than a detailed disease-control profile.

The 32-ounce bottle and oil item form help buyers distinguish this product's format when comparing fungicides. Its title identifies propiconazole 14.4, but the supplied product details do not establish particular lawn diseases, application rates, or a St. Augustine-specific use. That limits how precisely a buyer can match it to a diagnosed lawn issue using this information alone. Check the product label for authorized targets and application directions before selecting it for a treatment plan.

Skip it if you need named brown-patch coverage; Scotts DiseaseEx lists brown patch and 25 other lawn diseases.

Consider this only if the stated propiconazole formulation and oil form match your selection criteria. For a St. Augustine problem, verify the label's disease targets and directions before relying on it for a specific treatment.

Listed on Amazon as: Quali-Pro 83013366 Propiconazole 14.4 Fungicide, 32oz, White