Chemical Class and ACCase Inhibitory Action
Propaquizafop 10% EC belongs to the aryloxyphenoxypropionate ('FOP') chemical family of selective herbicides. It enters target grass weeds through leaf cuticles and translocates systemically via xylem and phloem to meristematic growing zones.
The active molecule selectively inhibits the plastidic acetyl-CoA carboxylase (ACCase) enzyme in monocotyledonous grasses, halting fatty acid synthesis. Cell membrane formation stops, resulting in heart-rot and death of the weed within 10 to 14 days.
- Active ingredient: Propaquizafop 10 percent w/w EC
- Herbicide classification: WSSA Group 1 / HRAC Group A (ACCase inhibitors)
- Selectivity: High crop selectivity in broadleaf crops; non-toxic to dicotyledonous plants
- Translocation: Systemic symplastic movement to root rhizomes and apical meristems
CIBRC Approved Target Weeds and Crops
Propaquizafop is registered by CIBRC for controlling narrow-leaved grassy weeds across major commercial pulses, oilseeds, and horticultural broadleaf crops.
Broadleaf crops naturally possess an insensitive eukaryotic form of ACCase, allowing Propaquizafop to eliminate competing grasses without causing phytotoxic stress to the primary crop.
- Soybean and Pulses: Controls barnyard grass (*Echinochloa colona*), crabgrass (*Digitaria* spp.), and goosegrass
- Onion and Garlic: Selective eradication of grassy flushes without leaf chlorosis
- Cotton and Groundnut: Post-emergence cleanup of fast-growing monocot weeds
- Target weed stage: Most effective when applied at the 2 to 4 leaf stage of actively growing grasses
Field Application Guidelines and Precautions
Optimum control depends on applying Propaquizafop when weeds are actively growing under adequate soil moisture. Severe drought stress forces weeds to develop thickened cuticles, reducing chemical uptake.
Use flat-fan nozzles delivering uniform droplet swaths. Avoid tank-mixing with broadleaf herbicides like 2,4-D or metsulfuron-methyl, as antagonism can reduce grassy weed efficacy.
- Application timing: 15 to 25 days after crop sowing when grasses have 2-4 true leaves
- Soil moisture: Adequate root-zone moisture is essential for active herbicide uptake
- Antagonism warning: Maintain a 3 to 5 day interval between grass and broadleaf herbicide sprays
- Safety gear: Wear rubber gloves, protective clothing, and safety glasses during handling
Official source
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Central Insecticides Board and Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
Why does Propaquizafop kill grassy weeds but leave broadleaf crops unharmed?
Broadleaf (dicot) plants possess an alternate, insensitive form of the acetyl-CoA carboxylase enzyme that is not inhibited by aryloxyphenoxypropionate herbicides.
Can Propaquizafop control nut sedge (Cyperus rotundus)?
No, sedges (*Cyperus* species) belong to the Cyperaceae family and are not controlled by ACCase grass herbicides like Propaquizafop.
How long after spraying Propaquizafop will grassy weeds die?
Weed growth stops within 48 hours; central heart leaves turn purple and brown within 5 to 7 days, with complete desiccation occurring within 10 to 14 days.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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