Diclofop-methyl 36% EC – Selective Post-Emergence Herbicide for Grass Weed Control

Diclofop-methyl 36% EC is a cyclohexanedione-class herbicide formulated as an emulsifiable concentrate, targeting grass weeds in cereal crops (wheat, barley) and select broadleaf crops. It inhibits acetyl-CoA carboxylase (ACCase), disrupting lipid synthesis in susceptible weeds. Known for its rapid foliar absorption and soil residual activity, it effectively controls resistant grass weeds like wild oats (Avena fatua) and black-grass (Alopecurus myosuroides)

Technical Specifications

Parameter	Specification
Active Ingredient	Diclofop-methyl 36% (w/w)
Chemical Class	Aryloxyphenoxypropionate (ACCase inhibitor, HRAC Group 1)
Formulation Type	Emulsifiable Concentrate (EC)
Target Weeds	Avena fatua (wild oats), Alopecurus spp. (black-grass), Digitaria spp. (crabgrass)
Solubility	Low water solubility (0.8 mg/L); lipophilic
Rainfastness	6 hours
Shelf Life	2 years (store at 10–30°C in sealed containers)

Key Features & Benefits

✅ Selective Control:

Kills grasses without harming wheat/barley.
Suppresses ACCase-resistant biotypes when applied early.
✅ Rapid Action:
Visible wilting in 24–48 hours; complete kill in 5–7 days.
✅ Soil Activity:
Moderate residual effect (DT₅₀: 7–14 days) prevents new flushes.
✅ Cost Efficiency:
Reduces manual weeding labor by 70% in field trials.

Application Guidelines

Field Recommendations (Spring Wheat, Qinghai, China):

Target Weed	Dosage (mL/ha)	Timing	Efficacy
Wild oats	1,800–2,700	Post-emergence (weed 1–3 leaves)	85–92% control
Crabgrass	2,000–2,500	Early tillering	80–88% control

Critical Practices:

Pre-application irrigation: Essential for activation (apply 4 days before spraying).
Spray Volume: 300–400 L/ha with medium droplets for coverage.
Avoid Mixing: Incompatible with sulfonylureas or alkaline adjuvants.

⚠️ Safety & Environmental Profile

Parameter	Data	Compliance
Mammalian Toxicity	Low (Rat oral LD₅₀: >1,300 mg/kg)	WHO Class III (Slightly hazardous)
Ecotoxicity	Highly toxic to fish (LC₅₀: 0.8 mg/L)	50m aquatic buffer required
Re-entry Interval	24 hours	Standard PPE mandatory

Precautions:
⚠️ Drift Management: Use anti-drift nozzles near broadleaf crops (e.g., legumes).
⚠️ Rotational Restrictions: Wait 30 days before planting vegetables.

Resistance Management

Rotation Partners:
- Sulfonylureas (e.g., mesosulfuron-methyl) for broadleaf weeds.
- PPO inhibitors (e.g., carfentrazone-ethyl) for resistant grasses.
Max Applications: 1 per season to delay ACCase resistance.