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.
Umbel browning and stem necrosis caused by diaporthe angelicae phomopsis dauci on carrot in france