See All ProductsMetsulfuron-methyl

Action

Herbicide

Use

Controls broadleaf weeds and annual grasses in barley, wheat, fallow, triticale, pastures, rangeland, and noncropland.

Formulation

Dry flowable, soluble granules.

Identification

Common Names

Metsulfuron-methyl (ISO); metsulfuron (ANSI, BSI, ISO-E, ISO-F, ISO, WSSA)

Exp. Code Number

DPX T6376

CAS Codes

74223-64-6 (ester or salt); 79510-48-8 (metsulfuron)

Other Code Number

SHA 122010

Chemistry

Compositions

Methyl 2-(4-methoxy-6-methyl-1,3,5-triazin-2-ylcarbamoylsulfamoyl)benzoate (IUPAC); Methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-amino]carbonyl] amino]sulfonyl]benzoate (CAS)

Class

Sulfonylurea.

Properties

Faint, sweet ester-like, white-to-pale yellow solid. Melting point 158°C. Soluble in acetone, methanol, and methylene chloride. Slightly soluble in hexane.

Mode of Action / Resistance Management

Chemical Group

sulfonylurea

Mode of Action

interferes with an enzyme, resulting in rapid cessation of cell division in both roots and shoots

Action Group

HRAC Group B; WSSA Group 2

Environmental Guidelines

Soil Particle Adsorption

pKa is 3.3 (in water at 25°C) and KD value is 1.4, Flanagan silt loam (pH = 6.5, 4.02% organic matter)

Water Solubility

270 ppm at pH 4.6, 9,500 ppm at pH 6.7

Safety Guidelines

Signal Word

CAUTION

Toxicity Class

III

Toxicity

(Rat): Oral LD50 >5000 mg/kg. (Rabbit): Dermal LD50 >2000 mg/kg

Handling/Storage Caution

Stable if kept dry