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Stegophora ulmea

Elm black spot disease

Description

Black spots on elm leaves caused by the fungus Stegophora ulmea are a symptom of Elm black spot disease. The spots are dark, circular, and can grow larger over time, often leading to premature leaf drop. This fungal infection primarily affects weakened trees and can spread in moist conditions through wind and rain. The fungus likely originated in North America, where it was first identified. It has since spread to various regions, including many parts of Europe, where it affects both native and introduced elm species. Proper sanitation, such as removing infected leaves and improving air circulation around the tree, can help reduce the presence and spread of the disease.

Symptom

The spots are dark, circular, and can grow larger over time, often leading to premature leaf drop.

Tree Species: Elm

Part of a plant- attacked: Leaf / Needle

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: Yes

Present in EU: Yes