Cotton rarely loses a field to one kind of weed, but it loses yield first to grasses: barnyardgrass, foxtails and their relatives germinate with the crop, sit in the same soil layer, and take water and nitrogen before the cotton root system can respond. The standard chemical answer is a post-emergence graminicide, and BNSD Agro (Shandong Bainong Sida Biotechnology Co., Ltd.) produces haloxyfop-P-methyl 108 g/L EC registered for annual grass weeds in cotton at 25–30 mL/667 m². This guide explains what the “P” in the name means, how the selectivity works, how to time the spray, and what an importer should check before shipping an EC to a hot port. Rates here are Chinese registration label rates; the destination-market label governs in your own country.
What Is Haloxyfop-P-Methyl?
Haloxyfop-P-methyl belongs to the aryloxyphenoxypropionate family — the “fop” graminicides — and acts as an ACCase inhibitor (HRAC group 1): it blocks acetyl-CoA carboxylase, the enzyme grasses need to build fatty acids for new membranes, so growing points and root meristems shut down and the plant declines. Three features define the product:
- Genuinely systemic. The active is absorbed through the leaf surface and translocates both upward and downward — critically, into rhizomes and growing points — so the whole grass plant dies, including the parts never touched by spray.
- Post-emergence only. This is a foliar treatment with no useful soil residual: it works on the grasses that have emerged, and its protection ends where the treated leaves end.
- The “P” prefix. Haloxyfop-P-methyl is built on the purified active enantiomer rather than the racemic mixture, so a given quantity of active delivers more herbicidal power — the reason the high-activity “P” forms have largely displaced the older racemates (well-established isomer chemistry).
Symptom development is slower than a contact herbicide’s: grass growth usually stops within days, followed by yellowing and reddening, then necrosis of growing points over one to three weeks. Patience is part of the technology.
The Registered Use: Annual Grass Weeds in Cotton
On the Chinese registration label, haloxyfop-P-methyl 108 g/L EC is registered for annual grass weeds in cotton at 25–30 mL/667 m² (667 m² = 1 mu ≈ 1/15 ha; the rate converts to roughly 375–450 mL/ha). The export pack is a sachet ladder built for retail channels:
- 20 mL sachets × 50 × 10 boxes — small units that dose one spray load, ship compactly and suit smallholder distribution.
In practice the label-rate targets are the annual grasses of cotton fields — the barnyardgrass, foxtail and crabgrass group — and the timing rule is the same across them: treat young, actively growing grasses, ideally at the 3-to-5-leaf stage, with good coverage of the leaf area that exists at spraying. Grasses that have already tillered or drought-stopped respond more slowly and may need the upper end of the rate range.
Why It Kills Grasses and Spares Cotton
The selectivity logic is the reason this product category exists:
- Target-site differences. The ACCase enzyme of sensitive grasses is inhibited at concentrations that the ACCase of tolerant broadleaf crops effectively shrug off, so cotton carries the treatment without injury at label rates while the grasses around it die.
- No broadleaf activity. ACCase-inhibitor graminicides act only on grasses. Broadleaf weeds in the same field are untouched, which is not a defect but a division of labour: broadleaf control comes from separately registered products for cotton, applied as the field program requires.
- Clean tank partners. Because the product has no auxin or ALS chemistry in it, it does not carry the antagonism issues that auxin herbicides create when mixed with grass killers. Specific combinations must nevertheless be sanctioned by the destination label and confirmed with a jar test.
- Manage the follow-up flush. With no soil residual, later-germinating grasses are not covered by an early spray; scouting between passes decides whether a second treatment is justified, always within the label’s application limits.
Two handling notes follow from the systemic, foliar mode of action: leave several rain-free hours after application so deposits are absorbed, and do not mow, cut or disturb treated grass in the days that follow — translocation needs intact leaves.
Sourcing Checks for the 108 g/L EC
For an EC whose selling point is isomer purity, quality control starts at the molecule:
- Content and isomer quality against COA. Every batch should ship with an HPLC certificate of analysis confirming the declared 108 g/L; where the active enantiomer is part of the specification, its identity should be verifiable in the documents — “P” products diluted with racemic stock are the classic fraud in this category.
- Solvent specification. Impure or off-spec solvents in cheap ECs cause odour, poor emulsification, pack corrosion and, ultimately, crop-safety complaints. Require full solvent disclosure.
- Emulsion behaviour. The concentrate should disperse in standard hard and soft water into a stable milky emulsion without creaming or oiling out.
- Sachet sealing. 20 mL sachets must be leak-tested for hot, humid destination climates; a leaking graminicide sachet in a retail carton damages everything it touches.
- DG handling. EC formulations are flammable liquids; confirm Class 3 dangerous-goods documentation and packaging before vessel booking — BNSD Agro handles DG cargo compliance as part of its export service.
- Documents in the supplier’s name. Chinese registration certificate, production licence and batch traceability, matching the goods.
The herbicide export range is listed in the herbicides catalogue. For samples, registration support documents or OEM packing, contact BNSD Agro.
FAQ
What weeds does haloxyfop-P-methyl control in cotton?
On the Chinese registration label: annual grass weeds in cotton, at 25–30 mL/667 m² of the 108 g/L EC — in practice the barnyardgrass, foxtail and crabgrass group of cotton fields. It has no activity on broadleaf weeds; those need separate, registered cotton products. Confirm the authorized spectrum on the destination-market label.
What is the label rate per hectare?
The Chinese label rate is 25–30 mL/667 m², which converts to roughly 375–450 mL/ha (1 mu = 667 m² ≈ 1/15 ha; multiply the per-mu rate by 15). The valid rate in your country is the one on the destination label.
Why choose haloxyfop-P over standard haloxyfop?
The “P” form is based on the purified active enantiomer, so each unit of active carries more herbicidal power than the racemic mixture — higher effective activity per litre of formulated product. That is why the high-activity “P” grades have largely replaced the older racemates in modern formulations.
Can haloxyfop-P-methyl control broadleaf weeds in cotton?
No. ACCase-inhibitor graminicides act only on grasses; broadleaf weeds are untouched. A complete cotton program pairs this product with broadleaf herbicides registered for cotton in the destination market, following the local label.
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