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Katyayani Metsulfuron Methyl 20% WP MSM is a selective post emergence herbicide belonging to the chemical family of SulfonylUrea herbicides. It is a systemic compound with foliar and soil activity used to control broadleaf weeds. It showcases residual activity i.e. it is retained by weed plants and inhibits its growth for a long period of time. MSM is an ALS herbicide. it acts as an Acetolactate Synthase (ALS) inhibitor. By hindering the synthesis of branched-chain amino acids namely valine , leucine and isoleucine.It obstructs the weed’s growth ultimately killing it. It has good rain-fastness even after 4 hrs of application. In soil, it sustains for a few days only and has a half life period with no effect on the following crops . Being a broadleaf weedicide , extreme care must be taken to avoid damage by drift onto broadleaf crops nearby .