Pencycuron is a phenylurea fungicide, it is a member of the class of phenylureas that is urea which is substituted by p-chlorobenzyl and cyclopentyl groups at position 1 and a phenyl group at position 3. A fungicide used to control diseases caused by Rhizoctonia solani and Pellicularia spp. It is not highly toxic to mammals but is moderately toxic to birds, most aquatic organisms, honeybees and earthworms. It has a role as an antifungal agrochemical. It is a member of monochlorobenzenes and a member of henylureas. It derives from an aniline.