Septoria cornicola

Leaf spot on dogwoods

Description

Septoria leaf spot on dogwoods Septoria cornicola is a fungal pathogen that primarily infects dogwood species (Cornus spp.). The fungus is widely distributed across European countries, thriving in moist environments conducive to its development, particularly if occur in the spring and autumn. Septoria cornicola overwinters in fallen leaves and other plant debris. During wet weather, fungal spores are spread by wind or rain, infecting new leaves in spring. The cycle repeats throughout the growing season in conducive conditions. It causes leaf spots, typically appearing as dark brown to black lesions with lighter centers. Severe infections can lead to premature leaf drop, weakening the tree over time, though it rarely causes tree death. While it doesn’t generally cause significant economic loss in forestry or agriculture, it can reduce the ornamental value of dogwoods in gardens and landscapes, affecting nurseries and plant sales. Effective management includes removing infected leaves and applying fungicides if necessary.

Symptom

It causes leaf spots, typically appearing as dark brown to black lesions with lighter centers. Severe infections can lead to premature leaf drop, weakening the tree over time, though it rarely causes tree death.

Tree Species: Dogwoods

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes