If your St. Augustine grass shows signs of disease, choose a targeted fungicide to protect and restore turf health. This guide highlights five effective products and explains who each is best for, plus practical buying tips. Perfect for homeowners seeking reliable, easy-to-use lawn fungicides that help manage Red Thread, Brown Patch, Dollar Spot, and other common infections.
Summary table of chosen products:
| Product | Best For | Form | ||
|---|---|---|---|---|
| BioAdvanced Fungus Control for Lawns – Ready-to-Spray | Small to mid-size lawns needing quick, hose-end treatment | Liquid spray | Up to 30 days | Easy spray, controls Red Thread & more |
| Scotts DiseaseEx Lawn Fungicide | Premature disease prevention and rapid action | Granular | Up to 4 weeks | Controls 26 diseases |
| BioAdvanced Fungus Control for Lawns, Granules, 10 lb | Larger lawns wanting granular coverage | Granules | Up to 30 days | Broad disease control |
| Spectracide Immunox Fungus Plus Insect Control For Lawns | Dual-action protection with insect control | hose-end concentrate | Rainproof in hours | Bi-disease and insect control |
| Atticus Gravex 20EW Fungicide (16 oz) | Broad-spectrum, systemic protection for diverse fungi | Liquid concentrate | Depends on label directions | Systemic fungicide with lasting impact |
BioAdvanced Fungus Control for Lawns – Ready-to-Spray
Features include curing and preventing lawn diseases on all lawn types, with up to 30 days of protection. It connects to a garden hose for easy application and treats Red Thread, Brown Patch, Dollar Spot, Rust, and Summer Patch. Best for homeowners needing a ready-to-use spray that covers up to 5,000 square feet.
Who it’s best for: small to medium-sized lawns seeking quick, uncomplicated treatment. This product is a strong fit for those who prefer ready-to-use hose-end spray rather than mixing granules. Caution: avoid using on non-lawn areas and follow label directions for best results.
Scotts DiseaseEx Lawn Fungicide, 10 lbs.
Features: prevents disease before it appears and controls disease at first signs; claims 26 diseases controlled, including brown patch, pythium blight, stripe rust, and red thread. Starts working within 24 hours, with disease control lasting up to four weeks when used as directed. Safe for all grass types when applied properly.
Best for: larger lawns or homeowners who want a granular product that provides extended protection. Limitation: effectiveness depends on proper distribution and watering in as directed.
BioAdvanced Fungus Control for Lawns, Granules, 10 lb
Contains 10 pounds of granules designed to treat up to 5,000 square feet and protect lawns for up to 30 days. It targets a wide range of diseases including Red Thread, Anthracnose, Brown Patch, Dollar Spot, and Powdery Mildew. Best for: those managing larger turf areas with a preference for granular application. Caution: distribute evenly to avoid patchy coverage.
Spectracide Immunox Fungus Plus Insect Control For Lawns
Dual-action formula controls major lawn diseases and kills listed lawn-damaging insects on contact. Rainproof in hours—resistant to washing away by rain or irrigation after drying. Start treatment in spring as grass greens up and treat every two weeks for the best ongoing protection. Best for: homeowners who want both fungus and insect control in one product. Limitation: may require more frequent applications in wet climates.
Atticus Gunner 14.3 MEC Propiconazole Fungicide (32 OZ)
Contains 14.3% propiconazole with a microemulsion concentrate (MEC) for easy mixing and stability. Provides predictable control, even with irregular weather, and remains on foliage after drying. Tank-mix compatible with many other fungicides for customization. Best for: turf managers seeking a systemic, easily mixable solution with flexible application. Limitation: follow label directions for soil and foliar use.
Atticus Gravex 20EW Fungicide (16 oz)
Gravex 20 EW combines myclobutanil (19.7%) with systemic action to combat a broad spectrum of fungi. It offers curative and preventive properties for turf and ornamentals, covering diseases like brown patch, red thread, rusts, anthracnose, and powdery mildew. Best for: professionals or advanced DIYers who need strong coverage across multiple host types. Caution: systemic fungicides require adherence to label directions to avoid plant stress.
Buying Guide
- Type of product: Hose-end liquids are quick and convenient for small lawns; granular formulations suit larger areas and longer intervals between applications.
- Active ingredient and spectrum: Propiconazole-based products offer broad-spectrum protection; copper-based products can be an option for organic approaches but may have different efficacy profiles.
- Timing and frequency: Some products offer rapid action within 24 hours, while others provide ongoing protection for 2–4 weeks. Align with lawn growth and climate patterns.
- Mode of application: Consider ease of use, mixing requirements, and compatibility with existing lawn care routines. Tank-mix compatibility increases flexibility.
- Lawn size and type: Choose a coverage amount that aligns with lawn square footage and grass type. For St. Augustine, ensure the product is labeled for use on warm-season grasses.
- Organic options: If organic gardening is a goal, look for copper-based fungicides or products labeled organic; be mindful of potential plant compatibility and harvest considerations.
- Safety and coverage consistency: Even distribution matters to avoid untreated patches. Follow label directions for timing, mixing, and weather constraints.
Frequently Asked Questions
- Which product is best for Red Thread on St. Augustine? BioAdvanced Ready-to-Spray and Granules products both target Red Thread among other diseases, with options for hose-end convenience or granular coverage.
- Can I use multiple fungicides at once? Some products are tank-mix compatible, but always follow the label. Mixing different products without guidance can cause plant damage or reduced efficacy.
- How soon will I see improvements after application? Some products show visible effects within 24 hours, while others require several days to a week for full results.
- Is there a risk of resistance with frequent use? Yes, continuous, identical treatments can contribute to resistance. Rotate products with different active ingredients when possible.
- Are these products safe for pets and children? Follow label directions for timing after application and restricted areas. Many lawn fungicides advise keeping people and pets off treated areas until dry.
- Should I treat preemptively in spring for St. Augustine? Preventive treatment is common when grass begins to green up; use a product labeled for spring protection and follow recommended intervals.
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