« Back

Erysiphe adunca

Willow powdery mildew

Description

Erysiphe adunca is a powdery mildew fungus parasitizing mainly willows (Salix spp.) and poplars (Populus spp.). It forms a thin white mycelial coating on both sides of the leaves, where later dark fruiting bodies develop. The fungus spreads by wind-borne conidia during the growing season and may persist from spring until autumn. It is widespread throughout Europe, occurring wherever willows and poplars grow. Intensity of infestation is usually not severe, but under favorable conditions the leaves can be almost completely covered, which reduces their ornamental value and may weaken their overall appearance.

Symptom

Whitish patches of powdery coating on both sides of the leaves; later numerous black dots (fruiting bodies) appear within the mildew.

Tree Species: Poplar, Willow

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 1 observations of the species in the system

Erysiphe aduncaWillow powdery mildew
milan
Number of votes: 0
Published: 10.9.2025