Flumioxazin 51% WDG Herbicide

Flumioxazin 51% WDG is a high-efficacy N-phenylimide herbicide formulated as a water-dispersible granule (WDG). Classified under Group 14 by the Weed Science Society of America, it inhibits protoporphyrinogen oxidase (PPO), disrupting chlorophyll synthesis and causing rapid necrosis in sensitive weeds upon sunlight exposure. It is primarily used for pre-emergence control of broadleaf weeds and grasses in field crops (e.g., soybeans, peanuts) and ornamental landscapes

Technical Specifications

Parameter	Specification
Active Ingredient	Flumioxazin 51% (w/w)
Chemical Class	N-phenylimide (PPO inhibitor, HRAC Group 14)
Mode of Action	Blocks chlorophyll synthesis → irreversible membrane damage
Formulation Type	Water-Dispersible Granule (WDG)
Target Weeds	Broadleaves (Amaranthus, Chenopodium), grasses (Digitaria, Setaria), and sedges
Rainfastness	1 hour
Solubility	Low water solubility (1.8 mg/L); stable in hard water

Key Features & Benefits

✅ Rapid Activity:

Visible weed necrosis within 2–4 hours of sunlight exposure; complete kill in 24–72 hours.
✅ Broad-Spectrum Control:
Suppresses >30 weed species, including resistant biotypes like Amaranthus palmeri (Palmer amaranth).
✅ Residual Protection:
Soil persistence (DT₅₀: 14–30 days) prevents new germinations.
✅ Crop Safety:
Selective for soybeans, peanuts, and tree nuts when applied pre-emergence.

Application Guidelines

Registered Uses:

Crop/Area	Target Weeds	Dosage (g/ha)	Timing
Soybeans	Pigweed, crabgrass	60–90	Pre-emergence (within 3 days of planting)
Ornamental Landscapes	Broadleaf invasives	40–60	Pre-emergence or early post-planting
Tree Nuts (Canada)	Chenopodium, Setaria	70–100	Soil-directed spray at dormancy

Critical Practices:

Activation: Requires 0.5–1 inch rainfall/irrigation within 7 days.
Avoid Foliar Contact: Direct spray on crop foliage causes phytotoxicity.
Tank-Mix Partners: Compatible with glyphosate for extended weed control.

⚠️ Safety & Environmental Profile

Parameter	Data	Regulatory Notes
Mammalian Toxicity	Low (Rat oral LD₅₀: >5,000 mg/kg)	WHO Class U (Unlikely hazardous)
Ecotoxicity	Highly toxic to fish (LC₅₀: 0.12 mg/L)	50m buffer from water bodies
Soil Binding	Koc: 1,200–2,000 (low leaching risk)	—
Re-entry Interval	12 hours	Standard PPE required

Precautions:
⚠️ Drift Management: Use coarse sprays to protect adjacent broadleaf crops.
⚠️ Rotational Restrictions: Wait 4 months before planting legumes or leafy vegetables.

Global Registration Status

Canada: Approved for field crops and landscapes (PMRA Registration, 2014).
USA: Registered for soybeans, peanuts, and tree nuts (EPA Reg. No. 7969-345).
MRLs:
- Soybean: 0.01 ppm (USA), 0.05 ppm (Japan)
- Tree Nuts: 0.10 ppm (Canada).

Advantages & Limitations

Advantages:
✅ Low Use Rate: 60–100 g/ha minimizes environmental load.
✅ Zero Volatility: Suitable for sensitive areas near urban landscapes.
✅ Resistance Management: Effective against glyphosate-resistant weeds.

Limitations:
⚠️ Ineffective on Established Weeds: Apply strictly pre-emergence.
⚠️ Sunlight Dependency: Cloudy weather reduces efficacy.

Packaging & Handling

Commercial Packs: 1 kg, 5 kg foil bags (moisture-proof).
Storage: 2 years at 10–25°C; avoid freezing or >40°C.

❓ FAQ

Q: Can it control mature weeds?
A: No – strictly for pre-emergence suppression.

Q: Rainfastness period?
A: 1 hour; reapply if heavy rain occurs earlier.

Q: Impact on earthworms?
A: Low risk (LC₅₀: >1,000 mg/kg soil).

Value Proposition:
Delivers rapid burndown, extended residual control, and resistance management for sustainable crop systems – reducing manual weeding costs by 50–70% in field validations