The mode of action of Pretilachlor involves inhibiting the synthesis of fatty acids in target plants. Pretilachlor is a member of the chloroacetamide herbicide group and primarily targets grassy weeds in rice crops. When Pretilachlor is applied to the soil or foliage of plants, it is taken up by the roots or absorbed through the leaves and then translocated within the plant. Once inside the plant, Pretilachlor inhibits the action of the enzyme acetyl-CoA carboxylase (ACCase), which is responsible for fatty acid synthesis. By inhibiting ACCase, Pretilachlor disrupts the production of essential fatty acids needed for the growth and development of the target plants. Without an adequate supply of fatty acids, the plants are unable to form important cell membranes and other lipid-containing structures, leading to growth inhibition and eventual death.