Tembotrione, the active ingredient in Laudis, inhibits the activity of the 4 hydroxy-phenyl-pyruvate-dexygenase (4 HPPD) enzyme. The formation of carotenoid (plant pigments) is disrupted by the blockage of the enzyme. Depletion of carotenoids deprives chlorophyll - where photosynthesis takes place - of its protection against an over dose of light and this results in chlorophyll bleaching.
The symptoms of Laudis action become visible fast and the full weed control effect is seen within a few days of application.
Herbicide Resistance Action Committee(HRAC) Classification Group F2