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Eriogaster lanestris

Small eggar moth

Description

Eriogaster lanestris, commonly known as the small eggar moth, is a species of moth found in Europe and parts of Asia. The female laying eggs in large clusters on the host tree. The eggs hatch within the span of a few days. The caterpillars form communal silk nests in tree branches or trunks where they reside and feed together. After reaching maturity, the caterpillars descend from the tree and pupate in the soil or under debris. The adult moths emerge from the pupae in the following spring. The caterpillars of Eriogaster lanestris can cause significant defoliation of trees. They feed on the leaves of various deciduous trees, including oak, birch, willow, etc. In severe infestations, the defoliation can weaken the host trees and affect their overall health.

Symptom

Silken nest on branches. Leaf defoliation on branches. Sometimes a parts of the crown are defoliated. Dark, hairy caterpillars.

Tree Species: Birch, Hawthorn, Lime, Blackthorn

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes

Last observations

There are a total of 4 observations of the species in the system

Eriogaster lanestrisSmall eggar moth
Matus Leng
Number of votes: 0
Published: 11.5.2025

Eriogaster lanestrisSmall eggar moth
jozef
Number of votes: 0
Published: 2.6.2023

Eriogaster lanestrisSmall eggar moth
rado
Number of votes: 0
Published: 2.6.2023