metsulfuronmethyl

Metsulfuronmethyl is a selective herbicide used to control a wide range of broadleaf weeds. It belongs to the sulfonylurea class of herbicides, which act by inhibiting the enzyme acetolactate synthase (ALS), essential for the synthesis of branched-chain amino acids in plants. This inhibition ultimately leads to the cessation of plant growth. Metsulfuronmethyl is applied to foliage or as a pre-emergence treatment and is absorbed by both the roots and leaves of susceptible plants. Its effectiveness is often observed as stunting, chlorosis (yellowing), and necrosis (tissue death). The herbicide is commonly used in various crops, including cereals, rice, and sugarcane, as well as in non-crop areas such as pastures and rights-of-way. It is formulated as wettable granules, soluble powders, or suspension concentrates. While effective against many broadleaf weeds, it generally has limited activity against grasses. Resistance to metsulfuronmethyl has been observed in certain weed populations due to repeated use. Environmental persistence and potential for off-target movement are considerations in its application.