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Phyllactinia guttata

Powdery mildew

Description

The mycelium develops especially on the lower side of leaves. On the living leaves it is sometimes only barely recognizable. Infected leaves are silvery on the underside. In the powdery covering are formed round yellow to orange cleistothecia. The mycelium penetrates into the intercellular space. It is a biotrophic pathogen.

Symptom

Yellow to orange spherical cleistothecia form between the flour coating.

Tree Species: Birch

Part of a plant- attacked: Leaf / Needle

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes