Psyllopsis fraxini agg.

Alternative names
Aggregate made up of:
Psyllopsis fraxini
Psyllopsis discrepans
Psyllopsis distinguenda.

The jumping plant louse Psyllopsis fraxini causes a gall to form on the leaves of Ash. Psyllopsis fraxini galls on Ash are indistinguishable from those produced by P. discrepans and P. distinguenda and have been treated as an aggregate for our recording purposes.

Identification difficulty

Adult Gall


Anywhere that Ash is present.

When to see it

Gall appears in spring and summer with the arival of the leaves, adult from June to November.

Life History

The time when the larvae leave the eggs mainly coincides with the beginning of foliation of Ash. Under the influence of toxins from larvae's glands, the edges of leaves swell, folding backwards, towards the middle, turning into loose galls which become brown and wither, but do not fall. The mature forms appear in early July.

UK Status

To follow

VC55 Status

Status in Leicestershire and Rutland to follow.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map