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Liriomyza congesta

Leaf-mining fly Liriomyza congesta

Description

Liriomyza congesta is a leaf-mining fly that primarily develops in the leaves of Fabaceae species. It is oligophagous, feeding on various legumes, but feeds alsoon some trees and shrubs - Colutea spp., Robinia pseudoacacia and Caragana spp. The larvae form an upper-surface, unbranched corridor mine that only slightly widens as it progresses. Initially, the mine is bright green, later turning whitish and eventually brown. Frass is deposited in a wide green band in the center, with small black granules on either side. Pupation occurs outside the mine.

This species is found across Europe, from southern Scandinavia to the Mediterranean region. In southern Europe, it has been reported as a pest of broad beans. While infestations usually do not cause significant damage, high larval densities can reduce the leaf surface available for photosynthesis, potentially leading to early defoliation and reduced plant vitality.

Symptom

On affected leaves, unbranched corridor mines appear on the upper surface. The mines are bright green at first, then turn whitish and brown. Frass forms a green central band, bordered by small black granules.

Tree Species: Black Locust, Caragana

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes