Metsulfuron Methyl 10% + Chlorimuron Ethyl 10% WP Herbicide Uses

Metsulfuron Methyl 10% + Chlorimuron Ethyl 10% WP is a combination of two sulfonylurea herbicides registered for use in India under the Insecticides Act, 1968, formulated as a wettable powder (WP). It is registered for transplanted paddy, where it controls sedges and broadleaf weeds at a very low dose per acre. This page lists its mode of action, key benefits and the recommended dosage as per the official Central Insecticides Board & Registration Committee (CIB&RC) list of approved herbicide uses (Government of India).

Which Weeds Does This Control? (Field Identification Guide)

Not sure whether the weeds in your field match this herbicide's use case? This guide helps match weed identification to this herbicide's approved crop-wise uses.

Mode of Action

Both metsulfuron methyl and chlorimuron ethyl belong to the sulfonylurea family (HRAC Group 2 / Group B) and work as ALS (acetolactate synthase) inhibitors. They are absorbed through the roots and leaves of weeds and move to the growing points, where they block the ALS enzyme needed to make the amino acids valine, leucine and isoleucine. The weeds stop growing soon after uptake, turn yellow and purple at the growing points and die gradually over 2–3 weeks. Rice breaks these herbicides down quickly, which makes the combination selective in paddy. Combining two sulfonylureas widens the range of sedges and broadleaf weeds controlled.

Features & Benefits

• Very low dose — only about 8 g of product per acre.
• Controls the major sedges (Cyperus, Fimbristylis) and broadleaf weeds (Eclipta, Monochoria, Marsilea, Ludwigia) of transplanted paddy.
• Two-ingredient sulfonylurea combination gives a wider weed spectrum than either ingredient alone.
• Applied early after transplanting, so weeds are controlled before they compete with the young crop.

Recommended Usage of Metsulfuron Methyl 10% + Chlorimuron Ethyl 10% WP Herbicide

The table below gives the recommended dose, water volume and waiting period per acre, converted from the CIB&RC-registered per-hectare rate — see the note below the table for conversion details. Always confirm against the current product label before use.

Figures above are converted from the CIB&RC-registered per-hectare rate (1 ha ≈ 2.47 acres): 4 g a.i./ha, 20 g formulation/ha, 300 L water/ha, applied pre-emergence about 3 days after transplanting, waiting period 90 days. Always confirm the current dose and timing on your specific product's label before use.

How to Use

1. Confirm your crop is transplanted paddy and identify the weeds present using the guide above.
2. Because the dose is very small (about 8 g per acre), weigh it accurately; first mix it into a little water to make a smooth paste, then add to the spray tank and top up to the full volume while stirring.
3. Apply about 3 days after transplanting, before the weeds emerge, as registered by CIB.
4. Keep a thin layer of water (about 2–3 cm) in the field at application, and do not drain the field or let water flow out for 3–4 days afterwards.
5. Use a knapsack sprayer with a flat-fan or flood-jet nozzle for uniform coverage; avoid overlapping passes.
6. Spray in calm weather, avoiding rain expected within a few hours.

Precautions & Safety

• Registered only for transplanted paddy — do not use on other crops.
• Sulfonylurea herbicides can damage sensitive crops at very low amounts; avoid drift to neighbouring crops and clean the sprayer thoroughly after use before spraying other crops.
• Both ingredients are ALS inhibitors (HRAC Group 2); avoid using herbicides of the same group every season on the same field and rotate with a different group to slow weed resistance.
• Wear appropriate PPE — mask, gloves, goggles and full-sleeved clothing — while mixing and spraying, and avoid inhaling the powder.
• Respect the 90-day waiting period (PHI) before harvest.
• Store in the original, tightly closed container in a cool, dry place away from direct sunlight, food and feed, and out of reach of children and livestock.

Brand names mentioned on this page are registered trademarks of their respective owners and are referenced here for identification purposes only; FarmMate is not affiliated with or endorsed by these brands. This page is for general information only — always consult your local agricultural extension office and confirm the current product label before use.