« Back

Andricus conificus (=cydoniae)

Gall wasp Andricus conificus

Description

Andricus conificus is a gall wasp that induces characteristic galls on oaks (Quercus spp.).

The galls of the sexual generation develop in spring as a result of excessive hypertrophic growth of terminal or lateral shoot buds. These buds transform into ovoid or nearly spherical swellings, ranging from 10 to 40 mm in diameter. Often, multiple galls merge, forming large clusters exceeding 50 mm. Young galls are light green, gradually darkening to dark green and eventually turning brown as they mature. Deformed or normal leaves may be present on their upper part. The sexual generation occurs primarily on Q. cerris, producing galls very similar to those of A. multiplicatus.

The galls of the asexual generation are elongated, conical, and can grow up to 2 cm in length. They frequently develop on young oak shoots, particularly on Q. petraea. These galls form during the summer.

Symptom

The galls of the asexual generation are elongated, conical, and can grow up to 2 cm in length. They frequently develop on young oak shoots, particularly on Q. petraea. These galls form during the summer.

Tree Species: Oak

Part of a plant- attacked: Leaf / Needle, Branch

Pest significance: Less harmful

Pest Category: Insects

Present in EU: Yes