Product Details
CasNo： 83164-33-4
MF： C19H11F5N2O2
Appearance： solid
Delivery Time： 15 days
Packing： 25kg/drum
Purity： 97%
1. Basic Information
- English Common Name: Diflufenican
- Molecular Formula: C₁₉H₁₂F₄N₂O₂
- Molecular Weight: 376.3
- CAS Registry Number: 83164-33-4
- Chemical Name: 2,4-Dichloro-2-(α,α,α-trifluoro-m-tolyloxy)-3-pyridinecarboxanilide
2. Physicochemical Properties
- Appearance: Technical material (purity ≥97%) is a white crystalline solid.
- Melting Point: 159.5℃
- Vapor Pressure: 4.25×10⁻³ mPa (at 25℃)
- Relative Density: 1.54
- Solubility (at 25℃):
- <0.05 mg/L in water
- Soluble in most organic solvents, e.g., 72.2 g/L in acetone, 65.3 g/L in ethyl acetate, 4.7 g/L in methanol
- Stability: Stable in air at temperatures below its melting point; extremely stable in aqueous solutions at pH 5, 7, and 9 (22℃); and shows excellent photolytic stability.
3. Toxicity
3.1 Mammalian Toxicity
- Acute oral LD₅₀: >5000 mg/kg (rats), >5000 mg/kg (dogs), >5000 mg/kg (rabbits)
- Acute dermal LD₅₀ for rats: >2000 mg/kg
- No irritation to rabbits’ eyes and skin
- Acute inhalation LC₅₀ (4h) for rats: >5.12 mg/L (air)
3.2 Ecotoxicity
- Acute oral LD₅₀: >2150 mg/kg (quail), >4000 mg/kg (mallard ducks)
- LC₅₀ (96h): >108.8 μg/L (rainbow trout), 98.5 μg/L (common carp)
- LC₅₀ (48h) for water fleas: 0.24 mg/L
- ErC₅₀ (72h) for algae: 0.00045 mg/L
- No toxic effects on honeybees (oral or contact exposure) and earthworms
4. Mechanism of Action
Diflufenican is an inhibitor of carotenoid biosynthesis. When applied before or after weed germination, it forms a leaching-resistant herbicidal layer on the soil surface. As weeds germinate and pass through this layer, their shoots or roots absorb the herbicide. The herbicide then inhibits carotenoid biosynthesis, leading to a decrease in carotenoid content in weed plants. This causes chlorophyll degradation and cell membrane damage, resulting in weed shoots turning pale or white, and eventually the entire plant wilting and dying.
5. Efficacy
- Features both pre-emergence and post-emergence control effects with a long residual period. It can kill already emerged weeds and prevent subsequent germinating weeds.
- Effectively controls most annual broad-leaved weeds in wheat fields, such as Galium aparine (cleavers), Fallopia convolvulus (black bindweed), Portulaca oleracea (common purslane), Solanum nigrum (black nightshade), Stellaria media (common chickweed), Veronica persica (Persian speedwell), and Viola arvensis (field pansy).
- Compatible with most grassy and broad-leaved herbicides, allowing for expanded weed control spectrum when mixed.
6. Formulations
Main formulations include:
- 50% Diflufenican Water-Dispersible Granules (WDG)
- 50% Diflufenican Wettable Powder (WP)
- 50% Diflufenican Suspension Concentrate (SC)
7. Suitable Crops & Application Methods
7.1 Suitable Crops
Primarily suitable for wheat fields (winter wheat and spring wheat).
7.2 Application Methods
- Apply via soil spray after winter wheat sowing but before seedling emergence.
- Dosage: 60-80 mL per mu (1 mu ≈ 0.0667 hectares), diluted in 20-30 kg of water for uniform soil spraying.
- Maximum application frequency: Once per crop season.
