Pyrimethanil 40% SC: High-Efficiency Fungicide for Crop Disease Control

Active Ingredient & Formulation

• Chemical Name: Pyrimethanil (CAS No. 53174-05-1)

• Chemical Class: Anilinopyrimidine

• Molecular Formula: C₁₂H₁₃N₃O

• Formulation Type: 40% SC (Suspension Concentrate)

• Physical Properties: Off-white flowable suspension, pH 5.5–7.5, density 1.05–1.10 g/cm³, compatible with water for dilution.

1. Systemic Uptake:

• • Absorbed by leaves, stems, and roots, translocated throughout the plant via xylem and phloem.

2. Biochemical Inhibition:

• • Blocks methionine biosynthesis in fungi by inhibiting adenosine triphosphate (ATP) synthase, disrupting spore germination and mycelial growth.

3. Disease Suppression:

• • Prevents infection at early stages and suppresses lesion expansion in established infections.

1. Broad-Spectrum Fungus Control:

• • Effective against 20+ fungal diseases, including botrytis, powdery mildew, and sclerotinia.

2. Systemic & Protective Action:

• • Translocates within plants to protect new growth; provides 7–14 days of residual protection.

3. Crop Safety:

• • Safe for use in sensitive crops like grapes and strawberries when applied as directed.

4. Residue Management:

• • Short soil half-life (7–14 days) allows flexible crop rotation; low MRLs compliant with global standards.

5. Cost-Effective:

• • Low application rates (150–350 g ai/ha) reduce input costs while maintaining high efficacy.

• Toxicity:

• • Low mammalian toxicity (LD₅₀ > 2000 mg/kg rat); moderate risk to fish (LC₅₀ 1–10 mg/L).

• Environmental Precautions:

• • Maintain 30 m buffer from water bodies; avoid spraying on windy days to prevent drift.

• Crop Rotation:

• • Wait 2–3 months before planting cruciferous crops (e.g., cabbage, broccoli).

• Storage:

• Standard Packs: 1L, 5L, 20L COEX containers with UV-protective labels.

• Regulatory Status:

• • Registered in EU, USA (EPA), China, and major fruit/vegetable producing regions.

• Shelf Life: 3 years under recommended storage conditions.

• Common Combinations:

• • With mancozeb for enhanced broad-spectrum disease control in tomatoes

• • With tebuconazole for powdery mildew and rust management in cereals

• Adjuvants:

• • Use non-ionic surfactants (0.2% v/v) to improve foliar adhesion in dry conditions.

• What diseases does Pyrimethanil 40% SC control?

• Can it be used in organic farming?

• What is the pre-harvest interval (PHI)?

• • Grapes: 14 days

• • Tomatoes: 7 days

• • Strawberries: 5 days

• How to manage resistance in botrytis?

• Is Pyrimethanil safe for bees?

• Grape Vineyards in Europe:

• Tomato Farms in North America: