Psyllopsis fraxini

Psyllopsis fraxini is a psyllid which lives within a gall on ash (Fraxinus excelsior).

Psyllopsis fraxini
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hemiptera
Family:	Liviidae
Genus:	Psyllopsis
Species:	P. fraxini
Binomial name
Psyllopsis fraxini (Linnaeus), 1758

Eggs are laid in the autumn on dormant buds and the nymphs hatch in the spring and feed on the leaves. The host plant reacts by producing extra cells and the affected areas becomes swollen and rolls downwards and encloses the wax covered nymphs. Each gall may contain two or three generations and by the end of summer contain all stages of the insect.^[1] The galls are pale-coloured with violet or red markings.^[2]