Leaf blight of Parsley

Septoria leaf spot of parsley is an important disease of parsley caused by Septoria petroselini. The fungus can be seed-borne and may also survive in plant debris and on volunteer plants. Under favourable environmental conditions, the disease can spread rapidly, affecting both yield and quality. Because of its seed-borne nature, the disease can potentially develop on crops under any production system, although those that are overhead watered are more at risk.