Simba contains 100 g/ L mesotrione and is presented as a fine, homogeneous, beige-colored suspension with a characteristic odor.
It is a systemic herbicide, which acts by inhibition of the enzyme 4-HPPD. The active substance belongs to the triketone class of chemicals and has a different mode of action from that of broadleaf weed control herbicides. It inhibits amino acid conversion and carotenoid biosynthesis, resulting in the destruction of chlorophyll (which is no longer protected) by sunlight. The symptom known as leaf bleaching occurs. The product is absorbed mainly through the leaves, but also through the roots and translocated throughout the plant via the xylem and phloem.
Simba is an early postemergent herbicide for use in corn for the control of important annual dicotyledonous and some annual monocotyledonous weeds. For maximum effect the weeds must be small, in the actively growing stage, the weather sufficiently warm, and adequate moisture. On dry soils the control effect may be reduced. Do not apply when weeds or the corn crop are wet. Application to seed corn crops is not recommended.
