Fenoxaprop 10% EC: Selective Grass Herbicide for Cereal Crops

Active Ingredient & Formulation

• Chemical Name: Fenoxaprop-P-ethyl (CAS No. 71283-70-4)

• Chemical Class: Aryloxyphenoxypropionate (ACCase inhibitor, HRAC Group 1)

• Molecular Formula: C₂₆H₂₂ClNO₄

• Formulation Type: Emulsifiable Concentrate (EC)

• Physical Properties: Yellowish-brown clear liquid, soluble in organic solvents, pH 5.5–7.5, density 1.05–1.10 g/cm³.

1. Foliar Uptake & Translocation:

• • Rapidly absorbed by weed leaves, translocated via phloem to meristematic tissues (growing points).

2. Biochemical Inhibition:

• • Blocks ACCase, preventing synthesis of long-chain fatty acids essential for cell membrane formation.

3. Symptom Progression:

• • 5–7 days: Leaf tips turn purple or red, growth cessation

• • 10–14 days: Widespread necrosis from leaf margins inward

1. Selective Grass Control:

• • Targets 20+ grassy weeds while sparing broadleaf crops; ideal for wheat-barley rotations.

2. Systemic Efficacy:

• • Translocates to roots, ensuring complete kill of perennial weeds like Johnsongrass.

3. Crop Safety:

• • Safe for use in cereals when applied at 2–4 leaf weed stage; minimal crop phytotoxicity.

4. Residue Management:

• • Short soil half-life (10–14 days) allows early rotation to soybeans, maize, or vegetables.

5. Cost-Effective:

• • Low application rates (50–120 g ai/ha) reduce input costs vs. multiple herbicide applications.

• Toxicity:

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

• Environmental Precautions:

• • Maintain 50 m buffer from water bodies; avoid spraying on windy days to prevent drift.

• Crop Rotation:

• • Wait 3 months before planting sensitive crops (e.g., beets, spinach); safe for legumes after 60 days.

• Storage:

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

• Regulatory Status:

• • Registered in EU, USA (EPA), China, and major cereal-producing regions.

• Shelf Life: 3 years under recommended storage conditions.

• Common Combinations:

• • With 2,4-D for broadleaf + grass control in wheat

• • With metribuzin for pre/post-emergent weed suppression in rice

• Adjuvants:

• • Use MSO (1% v/v) or non-ionic surfactants to improve herbicide uptake in dry conditions.

• What weeds does Fenoxaprop 10% EC control?

• Can it be used in rice fields?

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

• • Wheat/Barley: 45 days

• • Rice: 60 days

• How to manage herbicide-resistant wild oats?

• Is Fenoxaprop safe for turfgrass?

• Wheat Trials in Europe:

• Rice Trials in Asia: