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Isochnus sequensi

Weevil Isochnus sequensi

Description

Isochnus sequensi is a very small weevil (2–2.5 mm) associated mainly with willows (Salix spp.) and occasionally with poplars (Populus spp.). The species has one generation per year. Adults appear in spring and females lay eggs into leaves, where the larvae create brown blotch mines. Pupation takes place inside the mine. The mines are externally indistinguishable from those of Isochnus foliorum, so adults need to be reared or examined for reliable identification. The species is widespread in Europe and is locally abundant, especially on hybrid crack willow (Salix × fragilis). Infestation intensity is usually not severe, but in high numbers the leaves may become heavily blotted, which reduces their ornamental appearance and general vigor.

Symptom

Brown blotch mines on willow leaves, often several per leaf; in stronger attack the blotches may merge into larger discolored areas.

Tree Species: Poplar, Willow

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 1 observations of the species in the system

Isochnus sequensiWeevil Isochnus sequensi
milan
Number of votes: 0
Published: 9.9.2025