Chlorothalonil (2,4,5,6-tetrachloroisophthalonitrile) ni ifumbire mvaruganda ikoreshwa cyane cyane mugice kinini, fungiside idafite sisitemu, hamwe nibindi bikoreshwa nko kurinda inkwi, imiti yica udukoko, acariside, no kurwanya ibibyimba, ibibyimba, bagiteri, algae. Ni fungiside ikingira, kandi yibasira imitsi y’udukoko na mite, bigatera ubumuga mu masaha. Ubumuga ntibushobora guhinduka.