Eriophyes pyri

Description

Eriophyes pyri is a tiny mite that causes galls to form on the leaves of Rowan and other members of the rose family, including cultivated pear trees. The gall is seen more often than the mite which causes domed pustules with openings, on both leaf surfaces - green/yellow at first but turning brown.

Similar Species

Phyllocoptes sorbeus is also found on Rowan, and is similar, but has a dense whitish, pinkish or yellowish felt-like erineum on the under- or upper-side of the leaf.

Identification difficulty
ID guidance

Good photos of both under- and upper-side of leaf are needed, showing presence of pustules with openings.  The host plant should be noted in the Comments 

Habitat

On the leaves of Rowan and pear trees.

When to see it

Galls are visible from late spring or summer until autumn.

Life History

The mites escape from the gall through pores on either side of the leaf to pass the winter in bark crevices.

UK Status

Widespread and common in Britain.

VC55 Status

Common in Leicestershire and Rutland.

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Leicestershire & Rutland Map

MAP KEY:

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

UK Map