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Robin's Pincushion

©Les Binns

Robin's pincushion

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Living up to its name, the Robin's pincushion is a red, round, hairy growth that can be seen on wild roses. It is caused by the larvae of a tiny gall wasp that feeds on the host plant, but causes little damage.

Enw gwyddonol

Diplolepis rosae

Pryd i'w gweld

January to December

Top facts

Stats

Diameter of gall: 2.5cm
Common.

Ynghylch

The Robin's pincushion (also known as the 'Bedeguar Gall') is a gall caused by the larvae of a tiny gall wasp, Dipoloepis rosae. The gall is widespread and common, and can be found developing on the stems of Dog-roses during late summer; it acquires its reddish colour as it matures in autumn. Each gall holds many grubs, which feed on the gall tissues throughout the winter and emerge in spring as adults. The adults reproduce asexually and only a tiny number are male.

What to look for

Unmistakeable: the Robin's pincushion is a spherical, red, fibrous growth on the stems of Dog-roses. You are more likely to see the galls than the adult gall wasps or the grubs.

Where to find

Widespread.

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Female gall wasps lay their eggs on their host plants, which causes the plants to swell up into characteristically odd shapes. The larvae feed on the plant tissue inside the galls.