🧪 Active Ingredient Profile

Propiconazole Fungicide

Triazole Fungicide (DMI / Sterol Inhibitor)

Propiconazole is one of the most widely used lawn and landscape fungicides. It controls a broad spectrum of turf diseases including brown patch, dollar spot, and anthracnose. Works by inhibiting ergosterol synthesis — a critical component of fungal cell membranes. Both preventive and curative.

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Classification

Triazole Fungicide (DMI / Sterol Inhibitor)

Signal Word

Caution

Mode of Action

Demethylation inhibitor (DMI): blocks ergosterol biosynthesis → fungal cell membranes collapse

🎯 Target Pests

Brown patch, dollar spot, anthracnose, red thread, rust, powdery mildew, leaf spot, summer patch, snow mold, Fusarium, Sclerotinia. Also labeled for some tree and ornamental diseases. Very broad-spectrum triazole fungicide.

🏷️ Products & Brand Names

Banner MAXX (professional), Honor Guard PPZ, Infuse Systemic Granules (BioAdvanced — consumer), Ferti-lome Liquid Systemic Fungicide, Bonide Infuse, Quali-Pro Propiconazole. Available as liquid concentrate and granular formulations.

📋 Safety Data Sheet (SDS)

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Propiconazole Fungicide — Safety Data Sheet

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📄 Propiconazole Fungicide — Safety Data Sheet · View the complete SDS document above or download below

📄 CDMS Label & SDS Database 📄 EPA Label Search

⚠️ Safety & Precautions

Low mammalian toxicity (EPA Category III). Wear gloves and avoid skin contact during mixing. Keep children and pets off treated turf until dry (typically 2-4 hours). Do not apply near water bodies — toxic to aquatic organisms.

⚠️ Resistance management: Triazole fungicides are prone to resistance development when used exclusively. Rotate with fungicides from different FRAC groups (e.g., strobilurins, chlorothalonil) to prevent resistant fungal strains.

💡 Pro Tips

Preventive vs curative: Propiconazole works both ways, but it's significantly more effective when applied preventively before disease appears. For brown patch in warm-season turf, begin applications when nighttime temperatures consistently exceed 65°F.

Application rate: Typical homeowner rate is 1-2 fl oz per 1,000 sq ft. Water in lightly after application for soil-borne diseases (summer patch). For foliar diseases (brown patch), apply and do NOT water in — the fungicide needs leaf contact.

Systemic advantage: Propiconazole is absorbed by the plant and moves upward (acropetally). This means it protects new growth that emerges after application — something contact fungicides can't do.

💡 Did you know? Propiconazole was first registered in 1981 and remains one of the most important fungicides in turf management 40+ years later. It belongs to the same chemical family (triazoles) as some human antifungal medications like fluconazole.

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Reviewed by Derek GiordanoContent reviewed by a licensed pest management professional. Last reviewed: April 2026.