---
description: "Product name\r\nMefenacet 50% WP\r\n\r\n\r\nActive ingredient\r\nMefenacet\r\n\r\n\r\nCAS number\r\n73250-68-7\r\n\r\n\r\nContent\r\n50% w/w (wettable powder)\r\n\r\n\r\nAppearance\r\nOff-white to light brown free-flowing powder\r\n\r\n\r\nFormulation type\r\nWP (Wettable Powder)\r\n\r\n\r\nWetting time\r\nMeets standard wetting time requirement\r\n\r\n\r\nSuspensibility\r\n≥ 70–80% (typical spec, CIPAC method)\r\n\r\n\r\nWet sieve test\r\nResidue ≤ 2.0% through 75 μm sieve\r\n\r\n\r\npH (1% suspension)\r\n6.0–9.0\r\n\r\n\r\nMoisture\r\n≤ 2.0%\r\n\r\n\r\nPackaging\r\n500 g / 1 kg foil bags; 10–25 kg bulk bags (OEM options)\r\n\r\n\r\nIntended use\r\nSelective herbicide for"
title: Mefenacet 50% WP Herbicide - POMAIS Agriculture
image: https://www.pomais.com/wp-content/uploads/2026/09/Mefenacet-50-WP.jpg
---

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Mefenacet 50% WP Herbicide

[![Mefenacet 50% WP Herbicide](https://www.pomais.com/wp-content/uploads/2026/09/Mefenacet-50-WP-700x700.webp "Mefenacet 50 WP")](https://www.pomais.com/wp-content/uploads/2026/09/Mefenacet-50-WP.webp) [Mefenacet 50% WP](https://www.pomais.com/wp-content/uploads/2026/09/Mefenacet-50-WP.webp)

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# Mefenacet 50% WP Herbicide

**Mefenacet 50% WP** is a **selective wettable-powder herbicide** developed for **transplanted rice** and designed to control **barnyardgrass and other early-emerging grass weeds** during the critical establishment phase. As an acetanilide/benzothiazole-type herbicide with **systemic, root-absorbed activity**, the product delivers reliable performance in Asia’s intensive paddy-rice systems, where uniform, early weed suppression directly influences yield stability.

This formulation is positioned for distributors and professional applicators who require:

- **Consistent early-season grass control** in transplanted rice
- **A selective herbicide with a wide safety margin** when applied within the labelled timing
- **A cost-effective WP formulation** suitable for both sand-mix broadcasting and spray applications
- **A product aligned with Asian rice-growing practices**, where Mefenacet remains a core component of pre- and early post-emergence weed management

With strong compatibility across regional rice-production programs and flexible OEM options, Mefenacet 50% WP is a practical, high-value choice for building or strengthening a rice herbicide portfolio.

- Designed for Professional Buyers & Bulk Orders
- We support custom packaging, labeling, and formulation to meet your market needs.
- Export wholesale inquiries only.
- Please include destination country, business type (importer/distributor/registrant), and expected volume.
- Retail requests will not be processed.

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## About Mefenacet 50% WP Herbicide

| Product name | Mefenacet 50% WP |
| --- | --- |
| Active ingredient | Mefenacet |
| CAS number | 73250-68-7 |
| Content | 50% w/w (wettable powder) |
| Appearance | Off-white to light brown free-flowing powder |
| Formulation type | WP (Wettable Powder) |
| Wetting time | Meets standard wetting time requirement |
| Suspensibility | ≥ 70–80% (typical spec, CIPAC method) |
| Wet sieve test | Residue ≤ 2.0% through 75 μm sieve |
| pH (1% suspension) | 6.0–9.0 |
| Moisture | ≤ 2.0% |
| Packaging | 500 g / 1 kg foil bags; 10–25 kg bulk bags (OEM options) |
| Intended use | Selective herbicide for transplanted rice (where registered) |

## Mefenacet 50% WP Herbicide for Transplanted Rice

**Mefenacet 50% WP** is a **selective wettable-powder herbicide** developed for **transplanted rice**. It is widely used across Asia to control **barnyardgrass** and other early-emerging grass weeds that compete heavily with young rice seedlings.

The product works through **root and coleoptile absorption** and moves upward in the plant, where it **inhibits cell division and early growth**. This allows it to stop grass weeds before they establish, while maintaining **good crop safety** when applied within the recommended timing.

The formulation is a **50% wettable powder**, suitable for standard paddy-field practices such as sand-mix broadcasting or spray application (according to local label requirements). Its reliability and compatibility with transplanted rice systems make it a strong fit for distributors serving **China, Vietnam, Thailand, India, Japan, Korea** and other rice-producing markets.

Key points for your customers:

- Effective on **barnyardgrass**, the most problematic weed in paddy fields
- Designed for **pre-emergence and early post-emergence** use
- Selective to transplanted rice when applied at proper timing
- WP format offers **cost-efficient handling and easy mixing**
- Suitable for OEM/private label programs in multi-language packaging

## Mode of Action & Selectivity

Mefenacet belongs to the **acetanilide/benzothiazole herbicide group** and provides **selective control of early-stage grass weeds** in transplanted rice. The product is absorbed mainly through the **roots and coleoptile** of germinating weeds. After uptake, it moves upward in the plant and **inhibits cell division and growth at the meristem**, preventing weeds from emerging or developing beyond the early stages.

This mode of action delivers:

- Strong activity against **barnyardgrass** and other common paddy grasses
- Reliable performance in **flooded or moist soil conditions**
- Good crop safety when used within the labelled timing window
- Effective suppression of early-season competition, helping rice seedlings establish uniformly

Because Mefenacet targets sensitive growth points in young weeds, the product performs best when applied **before emergence or shortly after germination**, under stable water conditions as defined by the local label.

## Target Weeds and Rice Application Fit

Mefenacet 50% WP is designed for **transplanted rice paddies** and focuses on the **early control of grass weeds** that compete most strongly with young rice.

Typical targets include:

- **Barnyardgrass (Echinochloa spp.)** – primary target and key value driver
- Other **annual paddy grasses** emerging together with rice
- Certain **mixed weed populations** when used in programmes or premixes with other herbicides

The product is best suited for:

- **Transplanted rice fields** with stable water management
- Fields where **barnyardgrass is the dominant problem weed**
- Programs aiming for **clean, early fields** to reduce later weed pressure and labour

On its own, Mefenacet 50% WP focuses on **grass weed control**. In many markets it is also used as part of **premixes or tank-mix programmes** with sulfonylureas or other partners to broaden activity on **broadleaf weeds and sedges**, depending on local registration.

## Formulation & Product Features of Mefenacet 50% WP

**Mefenacet 50% WP** is a **wettable powder formulation** designed for easy handling in paddy-field conditions and for flexible use by distributors and applicators.

Key formulation features:

- **50% active ingredient content** – concentrated enough for efficient transport and storage
- **Free-flowing wettable powder** – designed to disperse quickly in water with proper agitation
- Suitable for **sand-mix broadcasting or spray application**, depending on local label and practice
- Compatible with common **rice herbicide programmes**, including premix or separate application with sulfonylurea partners

For distributors, the WP format provides a **cost-effective, familiar option** in many Asian rice markets where powdered formulations are still widely accepted and easy to distribute in small packs.

## Application Timing and Use Principles

Final instructions must always follow the **registered label in each country**, but the practical positioning is:

- Target crop: **transplanted rice**
- Typical timing: **within 1–7 days after transplanting**, when weeds are at **pre-emergence to early leaf stage**
- Best performance: under **shallow, stable water layer** in the paddy, as defined by local agronomy and label
- Usual practice: applied once per season as an **early-season foundation treatment** to keep the field clean during establishment

Mefenacet 50% WP works best when water management, timing and dose all align with the labelled recommendations, ensuring **strong barnyardgrass control with good crop safety**.

## Use Rate Logic for Mefenacet 50% WP

Mefenacet 50% WP is typically positioned in a **moderate-rate range** for transplanted rice, with the exact dose defined strictly by each country’s registered label.

General use logic for positioning:

- Most programmes fall within a **600–1500 g/ha** product range, depending on weed pressure and formulation.
- Some labels or mixtures specify narrower examples such as **\~600 g/ha** or **375–1200 g/ha**, depending on local agronomy.
- Dose decisions mainly depend on:
  - **Barnyardgrass pressure** and weed diversity
  - **Water management stability** in the field
  - **Soil type and organic matter**
  - Whether the product is applied **alone or as part of a premix**

Because dose is highly regulated in rice systems, you should always direct customers to follow **local label guidance** rather than using generalised numbers. For distributors, this section helps communicate **why dose ranges differ** between formulations and markets, without providing any operational details.

## Combination Options & Portfolio Fit

Mefenacet is frequently used in **premix or programme-based approaches** to widen weed coverage in paddy fields. Its strong grass control provides a solid base when paired with herbicides targeting broadleaf weeds or sedges.

Common industry combinations (depending on local registration):

- **Mefenacet + Bensulfuron-methyl / Pyrazosulfuron-ethyl / Imazosulfuron**  
   Expands control to broadleaf weeds and sedges.
- **Mefenacet + Butachlor / Pretilachlor / Oxadiazon**  
   Strengthens overall control of paddy grasses and early-season mixed weeds.
- **Mefenacet + Bentazone / Fenclorim**  
   Used in some markets for improved crop safety or spectrum adjustment.

This positioning allows you to present Mefenacet 50% WP not only as a **standalone grass herbicide**, but also as a **flexible building block** in a full rice-herbicide portfolio for Asian markets.

## Market Focus and Application Regions

Mefenacet 50% WP is primarily positioned for **paddy-rice markets in Asia-Pacific**, where transplanted rice and flooded-field management are standard practice.

Key application regions include:

- **China, Japan, Korea** – long-term use of Mefenacet-based products in intensive rice systems
- **Vietnam, Thailand, Indonesia** – strong demand for **early barnyardgrass control** in transplanted rice
- **India and South Asia** – used as part of pre- and early post-emergence rice herbicide programmes

In these markets, Mefenacet is often available both as **single-ingredient 50% WP** and as **premix products** with sulfonylureas or other rice herbicides, giving distributors flexibility to match local weed spectra and pricing tiers.

Outside Asia, Mefenacet use is **limited or niche**, and it is **not a mainstream product in the United States**. As a result, Mefenacet 50% WP should be positioned mainly as an **Asia-focused rice herbicide**, targeting importers, formulators and distributors who specialise in paddy-rice solutions.

For your portfolio, this means Mefenacet 50% WP is best used to:

- Strengthen your **rice herbicide range** in existing APAC markets
- Support local partners who already manage **transplanted rice under flooded conditions**
- Build **country-specific product lines** (single and premix) adapted to each market’s registration and weed profile

## Packaging and OEM Service

Mefenacet 50% WP is well suited to **small pack formats** for rice markets and bulk packs for local formulators.

Typical options:

- **Retail / farm packs**
  - 500 g foil bag
  - 1 kg foil bag or laminated bag
- **Bulk packs for repacking or local blending**
  - 10 kg / 20 kg / 25 kg multi-wall or woven composite bags

OEM / private label capabilities:

- Custom **brand design** and layout for rice herbicide ranges
- **Multi-language artwork** (e.g. English, Vietnamese, Thai, Hindi, Chinese, etc.)
- Alignment with **local regulatory requirements** for label text and safety icons

This allows you to integrate Mefenacet 50% WP into an existing **rice herbicide brand family** or build a new line from zero.

## Quality Control and Documentation

To support professional distributors and registration work, Mefenacet 50% WP is backed by a standard QC and documentation package:

- **Batch-level QC**
  - Active ingredient content
  - Moisture, suspensibility, wet sieve, pH
  - Low- and high-temperature storage checks
- **Documentation package**
  - COA (Certificate of Analysis) for each batch
  - MSDS / SDS compliant with international transport rules
  - TDS with key technical and handling information
  - Supporting data for stability or registration (where available and agreed)

This gives your customers confidence in **consistency, safety and traceability** across shipments.

## FAQ

**Q1. Is Mefenacet 50% WP suitable for direct seeding rice?**  
 Mefenacet is mainly positioned for **transplanted rice**. Use in direct-seeded rice depends on **local registration and label conditions** and should be confirmed case by case.

**Q2. Can Mefenacet 50% WP be premixed with sulfonylurea herbicides?**  
 Yes, many markets already use Mefenacet in **premixes or programmes** with sulfonylureas to broaden weed control. Any new formulation or mixture must respect **local registration and possible formulation patents**.

**Q3. How should we position Mefenacet 50% WP in our portfolio?**  
 As a **core barnyardgrass solution** for transplanted rice in **Asia-focused markets**, either as a standalone grass herbicide or as a base active for **rice herbicide premix lines**.

## Work with Us on Mefenacet 50% WP

If your business focuses on **paddy-rice markets in Asia-Pacific** and you want to:

- Strengthen your **barnyardgrass control products**
- Extend a **rice herbicide portfolio** with a proven active ingredient
- Develop **OEM or private-label solutions** with flexible packaging and documentation

we can supply **Mefenacet 50% WP** with:

- Stable quality and competitive pricing
- COA, MSDS, TDS and registration support
- Custom packaging and multi-language label design

You can use this section as the closing block on the product page to encourage **inquiries from importers, distributors and formulators**.

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- [Does Spinosad Kill Spider Mites?](https://www.pomais.com/faq-items/does-spinosad-kill-spider-mites/)February 24th, 2026
- [Will 2,4-D Kill Broom Sage?](https://www.pomais.com/faq-items/will-24-d-kill-broom-sage/)January 30th, 2026
- [Will 2,4-D Kill Cattails?](https://www.pomais.com/faq-items/will-24-d-kill-cattails/)January 28th, 2026
- [Will 2,4-D Kill Centipede Grass?](https://www.pomais.com/faq-items/will-24-d-kill-centipede-grass/)January 26th, 2026
- [Will 2,4-D Kill Johnsongrass?](https://www.pomais.com/faq-items/will-24-d-kill-johnsongrass/)January 22nd, 2026
- [Fipronil Rapidly Eliminates Fleas, Providing Swift Relief for Your Pet](https://www.pomais.com/faq-items/fipronil-rapidly-eliminates-fleas-providing-swift-relief-for-your-pet/)December 23rd, 2025
- [Does Spinosad Kill Lice Eggs?](https://www.pomais.com/faq-items/does-spinosad-kill-lice-eggs/)November 18th, 2025

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