Pyriofenone ((5-chloro-2-methoxy-4-methyl-3-pyridyl)(4,5,6-trimethoxy-o-tolyl)methanone) is a fungicide developed by Ishihara Sangyo Kaisha, Ltd. for the control of powdery mildew on cereals and mildew on grapes.  The fate of pyriofenone in the aquatic environment was investigated in laboratory studies with 14C-pyriofenone radiolabelled in the phenyl or pyridyl rings.  Although hydrolytically stable, pyriofenone is photolytically labile leading to the formation of a number of low level products.  However, the low quantum yield value suggests that photolysis is not likely to be a significant route of degradation of pyriofenone.  Pyriofenone is not readily biodegradable in a standard test, but in aquatic sediments pyriofenone is rapidly degraded (total system DT50: 5 � 12 days) by mineralisation and incorporation into bound residues initially via a series of demethylation and oxidation reactions.  Pyriofenone is approved for use in the EU and has an import tolerance for grapes to the USA (Section 3 submission in December 2013).

Pyriofenone: Fate in the aquatic environment

248th National Meeting (2014)

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