Chlorothalonil (2,4,5,6-tetrachloroisophthalonitrile) wani fili ne na halitta wanda aka fi amfani dashi azaman babban bakan, wanda ba na tsarin fungicides ba, tare da sauran amfani azaman kariyar itace, maganin kashe qwari, acaricide, da sarrafa mold, mildew, bacteria, algae. Yana da maganin fungicides mai kariya, kuma yana kai hari ga tsarin jijiya na kwari da mites, yana haifar da gurgunta cikin sa'o'i. Ba za a iya juya gurgunta ba.