Orchestes testaceus

Alder flea weevil

Description

Alder flea weevil Orchestes testaceus is a beetle from the family Curculionidae, belonging to the order Coleoptera. It primarily targets alder (Alnus spp.) trees. The females lay their eggs on the underside of the midrib or a thick lateral vein of alder leaves, leaving a noticeable large scar at the site. Initially, the larva tunnels within the midrib or vein, causing it to swell and become somewhat deformed. As it develops, the larva creates a mine—a narrow corridor that gradually widens as it progresses towards the leaf margin or tip. This mine is reddish-brown in color. The activity of Orchestes testaceus can leads to significant leaf damage. The larval feeding and mine formation result in the leaf becoming permanently rumpled, particularly since the mine is formed while the leaf is still unfolding. Throughout the summer, the mine gradually erodes. The combination of swollen midrib and shape of the mine, providing clear evidence of this Curculionidae beetle's presence.

Symptom

The larva creates a mine—a narrow corridor that gradually widens as it progresses towards the leaf margin or tip. This mine is reddish-brown in color.

Tree Species: Alder

Part of a plant- attacked: Leaf / Needle

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: No

Present in EU: Yes