Haloxyfop-P-methyl (D): Selective Post-Emergence Herbicide

Technical Introduction

Haloxyfop-P-methyl (D) is a selective post-emergence herbicide belonging to the aryloxyphenoxypropionate (AOPP) group, commonly known as “FOP” herbicides. It is the methyl ester of the R-enantiomer (P-isomer) of Haloxyfop, which provides higher biological activity compared to the racemic mixture.

• Mode of Action (MOA): Inhibits the enzyme acetyl-CoA carboxylase (ACCase), which is essential for fatty acid biosynthesis in grasses.

• Selectivity: Broadleaf crops are tolerant, while susceptible grassy weeds are killed.

• Absorption & Translocation: Taken up through foliage, translocated in both xylem and phloem, and concentrated in meristematic tissues, leading to cessation of grass growth and plant death.

Applications

• Target Weeds:

  • Annual grasses: Echinochloa spp. (barnyardgrass), Setaria spp. (foxtails), Digitaria spp. (crabgrass), Eleusine indica (goosegrass).

  • Perennial grasses: Cynodon dactylon (Bermudagrass), Sorghum halepense (Johnson grass).

• Major Crops:

  • Soybean

  • Groundnut (peanut)

  • Cotton

  • Vegetables (tomato, chili, onion, etc.)

  • Tea, coffee, and orchards (directed spray in inter-rows)

• Use Pattern:

  • Applied post-emergence, typically 10–25 days after sowing, when grasses are at 2–4 leaf stage.

  • Works best under active weed growth with adequate soil moisture.

✅ Advantages

• Highly selective: Controls grassy weeds without harming broadleaf crops.

• Systemic action: Kills roots and underground parts of perennial grasses.

• Low application rates: Effective at relatively small dosages compared to non-selective herbicides.

• Wide crop safety: Compatible with a variety of dicot crops.

• Useful in rotations: Reduces reliance on non-selective herbicides and supports integrated weed management.

⚙️ Specifications (Technical Parameters)

❓ FAQ

Q1: Can Haloxyfop-P-methyl be used in cereals like rice or wheat?
No. Cereals are grasses, and this herbicide would kill them. It is only safe in broadleaf crops.

Q2: How long after spraying can crops be irrigated?
Avoid irrigation for at least 6–8 hours after application to allow full absorption.

Q3: Is Haloxyfop effective on broadleaf weeds?
No, it specifically targets grass weeds. Broadleaf weeds are unaffected.

Q4: Can it be tank-mixed with other herbicides?
Yes, it can be mixed with broadleaf herbicides (like Imazethapyr, Bentazone, or 2,4-D) to provide broad-spectrum control. Always check compatibility before mixing.

Q5: How long does it take to see results?
Grass weeds stop growing within 2–3 days, with visible yellowing and necrosis appearing in 7–14 days.