Septoria

Septoria is a genus of fungal plant pathogens in the phylum Ascomycota. They cause necrotic leaf spots on the leaves of their hosts, producing filiform or cylindrical conidia inside pycnidia embedded in the leaves. Economically important species cause diseases on field crops, forages, and vegetables. The genus is widespread, and estimated to contain 1072 species.

==Notable species== Septoria apiicola is the cause of late blight of celery. It can survive on seeds, causing disease in the seedlings when they germinate.