Diaporthe is a genus of endophytic filamentous fungal plant pathogens.

Diaporthe species have been shown to transform the infection-inhibiting factors (+)-catechin and (−)-epicatechin into the 3,4-cis-dihydroxyflavan derivatives.

Some species, like Diaporthe toxica, produce secondary metabolites that result in toxicoses of animals such as lupinosis of sheep.

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