Fludioxonil is a synthetic phenylpyrrole chemical introduced by Ciba-Geigy (now Syngenta) in 1993 for use as a non-systemic fungicide.

It is used for the treatment of crops, particularly cereals, fruits and vegetables, and ornamental plants.

There was a particularly bad crop failure due to multiresistant B. cinerea in strawberry in Florida in 2012; in that year and many other years, fludioxonil is the only fungicide still providing any protection.

[1] Its mode of action is to inhibit transport-associated phosphorylation of glucose, which reduces mycelial growth rate.

[2] Fludioxonil is used against Fusarium, Rhizoctonia, Alternaria, Botrytis cinerea, and Stromatinia cepivora.