Mesosulfuron-methyl 
Action/Use:
- Herbicide
Use:
Postemergence herbicide for use on cereals.
Identification
Common Name(s): Mesosulfuron-methyl (ISOPA)
Chemistry
Class: Sulfonylurea.
Formula: C16H19N5O9S2.
Mode of Action / Resistance Management
Chemical Group: Sulfonylurea
Mode of Action: Inhibition of acetolactate synthase ALS (acetohydoxyacid synthase AHAS)
Action Group: HRAC Group B; WSSA Group 2
Registration
Outside U.S.A.: Launched in China, South Africa, and Turkey.
Environmental Guidelines
Water Solubility: 7 ppm at pH 5, 48 at pH 7
Safety Guidelines
Toxicity: (Rat): Oral LD50 >5000 mg/kg
Handling/storage Cautions: Protect from extreme heat and cold
Suppliers and Branded Products
Basic Producers:
Bayer CropScience (Mesomaxx*, Osprey*, Silverado*)
Premix Products:
+ Iodosulfuron-methyl-sodium
- Atlantis* — Bayer CropScience
- Cossack* — Bayer CropScience
+ Propoxycarbazone-sodium
- Olympus* Flex — Bayer CropScience
- Rimfire* — Bayer CropScience
- Rimfire* Max — Bayer CropScience
Discontinued Names:
Neper*
