Explore the best fungicides for St. Augustine grass, targeting diseases with precision. From effective brown patch control to preventative applications, discover a range of systemic and broad-spectrum options. Elevate your lawn care with application tips and eco-friendly choices for sustainable solutions. Combat St. Augustine grass fungus with confidence using these 100% effective treatments. Dive into our comprehensive guide and ensure a lush, disease-free lawn with the power of the finest fungicides available.
St. Augustine grass is a popular and best choice for lawns in warm and humid climates, but it is also susceptible to various fungal diseases that can cause brown spots, leaf spots, root rot, and other problems. To prevent and treat these diseases, you need to use a fungicide that is effective against the specific fungus that is affecting your lawn.
Best Fungicide for St. Augustine Grass
Azoxystrobin: Broad-Spectrum Disease Control
Azoxystrobin systemic fungicide that belongs to the strobilurin group. It works by inhibiting the mitochondrial respiration of fungal cells, which stops their growth and reproduction. Azoxystrobin is effective against a wide range of fungal diseases, including brown patches, gray leaf spots, take-all root rot, dollar spots, and southern blight. It also has a long residual effect, lasting up to 28 days after application.
Heritage G Fungicide, a granular fungicide containing azoxystrobin, can treat up to 28 common fungal diseases on St. Augustine grass and other turfgrasses. It requires minimal water to disperse and is suitable for use in golf courses, parks, and residential, commercial, and industrial areas.
Propiconazole: Systemic Fungal Disease Management
Propiconazole is another systemic fungicide that belongs to the triazole group. It works by inhibiting the biosynthesis of ergosterol, which is an essential component of fungal cell membranes. Propiconazole is effective against brown patches, gray leaf spots, dollar spots, rust, powdery mildew, and other fungal diseases.
It also has a curative and preventive effect, meaning it can stop existing infections and prevent new ones from occurring. BioAdvanced Fungus Control Fungicide is a top-rated product containing propiconazole, capable of treating up to 14 common fungal diseases on St. Augustine grass and other lawn grasses, covering up to 5000 sq ft of lawn area and killing insects.
Myclobutanil: Effective Against Brown Patch
Myclobutanil is another triazole fungicide that works similarly to propiconazole. It inhibits the ergosterol biosynthesis of fungal cells, which affects their membrane integrity and function. Myclobutanil is especially effective against brown patches, which is one of the most common and damaging fungal diseases of St. Augustine grass.
It can also control other diseases such as dollar spot, rust, powdery mildew, and anthracnose. DOW AgroSciences Fungicide is a myclobutanil-containing liquid fungicide that can treat up to 15 common fungal diseases on St. Augustine grass and other turfgrasses, with a low odor and low use rate.
Thiophanate-Methyl: Wide-Range Fungicide
Thiophanate-methyl is a systemic fungicide that belongs to the benzimidazole group. Interfering with the cell division of fungal cells, which prevents them from multiplying and spreading. Thiophanate-methyl is effective against a wide range of fungal diseases, including brown patches, gray leaf spots, dollar spots, take-all root rot, summer patches, necrotic ring spots, and fusarium patches.
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Clears 3336F Fungicide is a thiophanate-methyl product that can treat up to 20 common fungal diseases on St. Augustine grass and other turfgrasses, with a low use rate and low toxicity when mixed with water.
Fluoxastrobin: Rapid Absorption for Quick Protection
Fluoxastrobin is a systemic strobilurin fungicide that belongs to the QoI (quinone outside inhibitor) group of fungicides. Blocking the electron transport chain in the fungal cells, disrupting their energy production and killing them. Fluoxastrobin is one of the fastest-acting fungicides, as it is rapidly absorbed by the plant and translocated to all parts of it.
It provides both preventive and curative control of fungal diseases, like brown patches, gray leaf spots, dollar spots, anthracnose, and pythium blight. One of the best products containing fluoxastrobin is Disarm G Fungicide Granules. A 30-pound bag can cover up to 10,800 square feet of lawn. It is easy to apply with a broadcast spreader and has low water solubility, meaning it won’t wash off easily.
Pyraclostrobin: Long-Lasting Disease Suppression
Pyraclostrobin is another systemic strobilurin fungicide that works similarly to fluoxastrobin. It also blocks the electron transport chain in the fungal cells, causing them to die. Pyraclostrobin is known for its long-lasting residual activity, as it can protect the plant for up to 28 days after application. It also has a broad-spectrum activity against many fungal diseases, such as brown patches, gray leaf spots, dollar spots, rust, and powdery mildew.
One of the best products containing pyraclostrobin is Insignia SC Intrinsic Brand Fungicide. It comes in a 1-pint bottle that can treat 16,000 square feet of lawn. It is a liquid concentrate that needs to be mixed with water and sprayed with a pump sprayer.
Fenarimol: Ergosterol Biosynthesis Inhibitor
- Fenarimol is a systemic triazole fungicide that belongs to the DMI (demethylation inhibitor) group of fungicides. Inhibiting the synthesis of ergosterol, component found fungal cell membrane. Without ergosterol, the fungal cells become leaky and die.
- Fenarimol is effective against several fungal diseases that affect St. Augustine grass, such as gray leaf spot, take-all root rot, spring dead spot, and fairy ring. It also has some activity against brown patch and dollar spot.
- One of the best products containing fenarimol is Rubigan EC Fungicide. It comes in a 1-quart bottle that can treat up to 21,780 square feet of lawn. It is a liquid emulsifiable concentrate that needs to be mixed with water and sprayed with a pump sprayer.
Mancozeb: Contact Fungicide for Leaf Spot Diseases
Mancozeb is a contact dithiocarbamate fungicide that belongs to the MBC (multi-site contact) group of fungicides. It works by interfering with multiple biochemical processes in the fungal cells, such as respiration and enzyme activity. The plant does not absorb Mancozeb and only works on the surface of it. Therefore, it needs to be applied before or at the first sign of infection.
It provides good control of leaf spot diseases such as gray leaf spot and helminthosporium leaf spot. One of the best products containing mancozeb is Dithane M-45 Fungicide. 6-pound bag that can treat up to 16 acres of lawn. It is a wettable powder that needs to be mixed with water and sprayed with a pump sprayer.
Chlorothalonil: Multi-Disease Protection
Chlorothalonil is a contact chloronitrile fungicide that belongs to the MBC group of fungicides. It works by disrupting the cellular respiration and energy production in the fungal cells, causing them to die. The plant does not absorb Chlorothalonil and only works on the surface of it. Therefore, it needs to be applied before or at the first sign of infection.
Provides control of a wide range of fungal diseases, such as brown patches, gray leaf spots, dollar spots, anthracnose, and rust. One of the best products containing chlorothalonil is Daconil Ultrex Turf Care Fungicide. It comes in a 5-pound bag that can treat up to 18,000 square feet of lawn. It is a granular formulation that needs to be watered in after application.
Triadimefon: Rust and Powdery Mildew Control
Triadimefon is a systemic triazole fungicide that belongs to the DMI group of fungicides. Inhibiting the synthesis of ergosterol, Component of fungal cell membrane. Without ergosterol, the fungal cells become leaky and die. Triadimefon is effective against several fungal diseases that affect St. Augustine grass, such as rust, powdery mildew, take-all root rot, and spring dead spots. It also has some activity against brown patch and dollar spot.
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One of the best products containing triadimefon is Bayleton 50 WSP Fungicide. It comes in a box of four 5.5-ounce packets that can treat up to 22,000 square feet of lawn. It is a water-soluble packet that needs to be dissolved in water and sprayed with a pump sprayer.
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Conclusion
From broad-spectrum disease control to systemic management, these effective solutions combat brown patches and more. Embrace a lush, vibrant lawn with these 100% proven fungicides for optimal results.
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