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Phytomyza cytisi

Leaf-mining fly Phytomyza cytisi

Description

Phytomyza cytisi is a leaf-mining fly whose larvae develop in the leaves of laburnum (Laburnum anagyroides, Laburnum alpinum). Occasionally, it has been recorded on Cytisus ratisbonensis, Cytisus supinus, and Petteria ramentacea. The larvae create a broad, upper-surface corridor mine, which may sometimes extend to the lower surface. The primary feeding lines are distinct, and frass is initially deposited in grains, later forming short thread-like fragments arranged in two close rows along the edges. Pupation occurs outside the mine.

The species is distributed across Europe. It has two generations per year, with larvae present from mid-June to mid-August and from early September to mid-October. Infestations primarily cause aesthetic damage, but a high number of mines can reduce the photosynthetic capacity of leaves, leading to premature defoliation and a decline in ornamental value.

Symptom

On affected laburnum leaves, broad corridor mines are visible, often with distinct feeding lines. Frass is first deposited in grains, later forming short thread-like fragments along both sides of the mine.

Tree Species: Laburnum

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes