Chlorothalonil is a broad-spectrum contact, multi-site inhibitor fungicide affecting various enzymes and other metabolic processes in fungi. It inhibits spore germination and is toxic to fungal cell membranes.
Cymoxanil is a penetrant fungicide with protectant and curative activity. Its post-infection activity stops the development of the fungus during the incubation. It inhibits different metabolic processes like the synthesis of nucleic acids, amino acids, etc., in fungi. It can penetrate the crop leaf and improve the effectiveness of companion fungicides, especially during periods of intensive disease pressure.