Metamifop 20% EC, OD Herbicide | Selective Post-Emergence Grass Control

Metamifop 20% EC (Emulsifiable Concentrate) is a premium selective herbicide designed for post-emergent control of annual and perennial grassy weeds in rice, soybeans, cotton, and other broadleaf crops. As an aryloxyphenoxypropionate (FOP) herbicide, it inhibits acetyl-CoA carboxylase (ACCase), disrupting lipid biosynthesis in target grasses while leaving dicotyledonous crops unharmed. The EC formulation ensures rapid emulsification in water, providing uniform coverage and enhanced absorption through leaf cuticles.

Technical Specifications

Parameter	Details
Active Ingredient	Metamifop (CAS No. 168085-00-3)
Chemical Class	Aryloxyphenoxypropionate (FOP)
Mode of Action	ACCase inhibitor (HRAC Group 1)
Formulation Type	20% EC (200 g/L active ingredient)
Appearance	Clear to slightly yellow liquid
Solubility	0.002 g/L in water; miscible in organic solvents
pH Range	5.0–7.0
Density	1.05–1.10 g/cm³

Specification	Targets	Dosage
20%EC	Annual grass weeds	525-600 ml/ha
20%OD	Annual grass weeds	525-600 ml/ha
10%WP	Annual grass weeds	1200-1800 g/ha
Metamifop 18%+Cyanosulfuron 24% EC	Annual grass weeds	300-150ml/ha
Metamifop 3.3%+Bentazone 16.7% ME	Annual grass weeds	3150-3600ml/ha
Metamifop 10%+Penoxsulam 2% OD	Annual grass weeds	900-1200ml/ha
Metamifop 10%+Quinclorac 15% OD	Barnyard grass	900-1200ml/ha
Metamifop 10% + Propanil 30% EC	Annual grass weeds	1200-1500ml/ha
Metamifop10%+Cyanosulfuron 15%+ Quinclorac10% OD	Annual grass weeds	600-900ml/ha
Metamifop 12%+ Cloflupyr 2-ethylhexyl ester 6%+ Cyhalofop-butyl 18% OD	Annual grass weeds	600-750ml/ha
Metamifop10%+Cyanosulfuron 15%+ Quinclorac10% OD	Annual grass weeds	600-900ml/ha
Metamifop 12%+ Cloflupyr 2-ethylhexyl ester 6%+ Cyhalofop-butyl 18% OD	Annual grass weeds	600-750ml/ha
Metamifop 2.9%+Clomazone 2.9%+ Propanil 30.2% EC	Annual grass weeds	1800-2400ml/ha

Mode of Action

Systemic Uptake:
- Absorbed through leaves and translocated via phloem to meristematic tissues.
Biochemical Inhibition:
- Blocks ACCase enzyme, preventing fatty acid synthesis essential for cell membrane production.
Symptom Progression:
- 3–5 days: Chlorosis in new growth
- 7–14 days: Widespread necrosis and plant death

Application Guide

Crop	Target Weeds	Dosage (L/ha)	Application Timing
Rice	Barnyardgrass, crabgrass	0.6–1.0	3–5 leaf stage of weeds

Application Tips

Water Volume: 200–400 L/ha for uniform coverage
Adjuvants: Add non-ionic surfactant (0.2–0.5% v/v) to enhance efficacy
Tank Mixes:
- With bentazone for broadleaf control in rice
- With fomesafen for soybeans
Weather: Avoid spraying during extreme heat (>30°C) or drought stress

Key Advantages

Selective Grass Control:
- Controls 30+ grass species, including resistant biotypes (e.g., ACCase-resistant barnyardgrass).
Rapid Action:
- Visible symptoms within 3–5 days; complete kill in 2 weeks.
Crop Safety:
- Formulated for minimal phytotoxicity in rice, soybeans, and vegetables.
Resistance Management:
- Rotate with Group 2 (ALS inhibitors) or Group 15 (acetochlor) herbicides.
Environmental Profile:
- Low mammalian toxicity (LD₅₀ > 2000 mg/kg)
- Short soil residual (DT₅₀ 10–15 days)

Safety & Environmental Notes

Toxicity:
- Moderate toxicity to fish (LC₅₀ 1–10 mg/L); avoid water bodies.
- Low toxicity to bees (LD₅₀ > 100 μg/bee).
Storage:
- Store in original container at 5–30°C; keep away from heat and open flames.
Handling:
- Wear protective clothing; avoid contact with skin and eyes.

Packaging & Compliance

Standard Packs: 1L, 5L, 20L COEX containers
Custom Solutions:
- Private labeling with multilingual instructions
Shelf Life: 3 years under recommended storage conditions

FAQ

Q1: Can Metamifop 20% EC be used in wheat or barley?
A: No.

Q2: What is the pre-harvest interval (PHI)?
A: PHI varies by crop:

Rice: 30 days
Soybeans: 21 days
Cotton: 28 days

Q3: How to handle resistance management?
A: Avoid consecutive applications; rotate with Group 2 or Group 15 herbicides.

Q4: Can it be mixed with fungicides?
A: Generally compatible with most fungicides. Conduct a jar test before large-scale mixing.

Q5: What is the difference between EC and OD formulations?
A: EC offers faster emulsification, while OD (Oil Dispersion) provides better adhesion in dry conditions.

Field Performance

Rice Trials in Vietnam:
0.8 L/ha controlled 95% of barnyardgrass and crabgrass at 21 days post-application.
Soybean Trials in Brazil:
1.0 L/ha + fomesafen reduced grass competition, increasing yields by 12–15%.

Residue Limits

Crop	MRL (mg/kg)	Regulatory Region
Rice	0.05	EU, Codex Alimentarius
Soybeans	0.1	EPA, China
Cotton	0.02	Japan, Korea

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