Active ingredient and biochemical mode of action
The active herbicide operates as an acetolactate synthase (ALS / AHAS) inhibitor, classified under HRAC Group 2. By inhibiting the ALS enzyme, it halts the biosynthesis of essential branched-chain amino acids (valine, leucine, and isoleucine) in susceptible weeds, leading to rapid chlorosis of growing points and plant death within 7 to 14 days.
- Herbicide group: ALS inhibitor (HRAC Group 2)
- Action spectrum: Post-emergence control of Echinochloa grasses, Cyperus sedges, and broadleaf weeds
- High selectivity: Readily metabolized by rice plants without retarding crop growth
Application window and water management in paddy
- Application timing: Apply 15 to 25 days after transplanting or sowing when target weeds are at the 2 to 4 leaf stage.
- Drainage rule: Drain standing field water completely prior to spraying so weed foliage is fully exposed to spray droplets.
- Re-irrigation rule: Re-flood fields within 48 hours after application and maintain standing water of 2 to 3 cm for 5 to 7 days to prevent weed re-emergence.
Safe spraying practices
Apply using a knapsack sprayer fitted with flat-fan or floodjet nozzles for uniform surface deposition. Avoid spraying under high wind or impending rainfall. Wear protective footwear, gloves, and masks, and strictly observe CIBRC label-approved dosages.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is the primary crop for Patela herbicide application?
It is formulated specifically for weed management in transplanted and direct-seeded rice (paddy) fields.
Why must water be drained before applying post-emergence paddy herbicides?
Draining water exposes submerged weed leaves directly to the herbicide spray droplets for maximum chemical absorption.
When should irrigation water be reintroduced after spraying?
Reintroduce irrigation water 24 to 48 hours after spraying and maintain standing water to prevent new weed germination.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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