Artichoke Gall

Andricus foecundatrix

Artichoke Galls on English Oak and Sessile Oak are caused by the asexual generation of a gall wasp. They begin to appear around June. The enlarged buds can grow up to 30mm in length, with each gall containing one larva. The mature gall falls to the ground in August, leaving dried scales on the twig. Also known as the Hop Gall.