2023
TQ7161 : Biorhiza pallida - Oak apple gall
taken 2 years ago, near to Snodland, Kent, England

Biorhiza pallida - Oak apple gall
Oak apple galls are found between May and June on oak trees, where a female gall-causer wasp (Biorhiza pallida) has laid her eggs in a leaf bud, causing it to form an oak apple gall. Inside the gall, there are a number of chambers, each housing a larva that develops into a gall wasp which emerges in June or July.
Seen here on a pedunculate oak tree (Quercus robur) in the country park at the former gravel pits known as Leybourne Lakes, near Snodland in Kent. Ref:P5020098ag.
Seen here on a pedunculate oak tree (Quercus robur) in the country park at the former gravel pits known as Leybourne Lakes, near Snodland in Kent. Ref:P5020098ag.
Cecidology - the study of Galls
Cecidology is the name for the study of the world of galls.
A gall or a cecidium (plural: cecidia) is an abnormal growth in a plant caused by specific gall-causing insects, mites, or fungi.
Examples include the Oak Apple, that looks like a small round fruit but is actually a plant deformity caused by a wasp.
for info see: The British Plant Gall Society: Link![]()