What does Metsulfuron-Methyl kill?

Metsulfuron-methyl is a powerful and selective systemic herbicide used widely across agriculture, forestry, pasture, and industrial vegetation management. This article focuses on answering the core question — what does metsulfuron-methyl kill? - Metsulfuron-methyl kills many broadleaf weeds like pigweed, thistles, wild radish, bindweed, dandelion, and shepherd’s purse. It also suppresses some woody plants like blackberry and sweet briar, and can control a few grassy weeds like brome and ryegrass when used properly.

What Does Metsulfuron-Methyl Kill?

Metsulfuron-methyl is especially effective against broadleaf weeds and certain annual and perennial grassy weeds, depending on the formulation and rate. The active ingredient works by inhibiting the ALS enzyme (acetolactate synthase), which is essential for plant growth. Susceptible plants stop growing shortly after application.

Key Broadleaf Weeds Controlled:

• Pigweed (Amaranthus spp.)
• Mustards (Brassica spp.)
• Thistles (Cirsium spp., Carduus spp.)
• Bindweed (Convolvulus arvensis)
• Chickweed (Stellaria media)
• Dandelion (Taraxacum officinale)
• Plantain (Plantago spp.)
• Sowthistle (Sonchus spp.)
• Wild Radish (Raphanus raphanistrum)
• Cocklebur (Xanthium spp.)
• Shepherd’s Purse (Capsella bursa-pastoris)
• Knotweed (Polygonum spp.)

Woody and Brushy Species Suppressed:

• Blackberry (Rubus spp.)
• Eucalyptus saplings
• Sweet briar (Rosa rubiginosa)
• Mesquite and woody legumes

Certain Grassy Weeds (less common):

• Brome grasses (Bromus spp.)
• Certain annual ryegrasses (Lolium spp.)

This herbicide is not recommended for general control of grasses, but it can suppress specific species when used in combination products or at higher rates.

Mode of Action (Brief Overview)

Metsulfuron-methyl belongs to the sulfonylurea group of herbicides and inhibits ALS enzyme activity, which disrupts amino acid synthesis. This results in halted cell division and plant death. It is absorbed through both leaves and roots.

Application Sites

• Cereals (wheat, barley, oats)
• Pasture and rangelands
• Non-crop areas and industrial sites
• Forestry (site preparation and plantation management)
• Sugarcane (in some regions, for broadleaf weed suppression)

Recommended Use Rates

Rates vary by crop and target species but typically range from 5–15 g a.i./ha. Higher rates are used in non-crop and industrial vegetation management scenarios.

Tank Mix Compatibility (Brief)

Metsulfuron-methyl is often tank-mixed with:

• Glyphosate – for broad-spectrum knockdown
• 2,4-D or MCPA – to expand broadleaf weed control
• Dicamba – in cereal and pasture systems

Always follow compatibility tests and label directions.

Resistance Management (Brief)

Due to its ALS-inhibiting mode of action, there is a moderate to high risk of resistance development. Rotate with herbicides from other HRAC groups and avoid repetitive solo use.

Safety and Environmental Profile (Brief)

• Low toxicity to humans and animals when used as directed
• Low leaching potential in most soils
• Toxic to aquatic organisms — avoid application near water
• Avoid drift to desirable vegetation

Packaging and Customization

POMAIS offers:

• Metsulfuron-Methyl 60% WDG and 20% WP
• Packaging options: 10g–500g sachets, 1kg bags, bulk cartons
• OEM labeling and formulation customization available

Partner with POMAIS

If your weed control program involves persistent broadleaf species or woody invaders, Metsulfuron-methyl from POMAIS offers a high-performing, cost-effective solution. Contact us to explore product availability, registration support, or private-label opportunities.