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Knopper Gall

©Les Binns

Knopper Gall

©Amy Lewis

Knopper gall wasp

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The knopper gall wasp produces knobbly red, turning to brown, growths, or 'galls', on the acorns of Pedunculate Oak. Inside the gall, the larvae of the wasp feed on the host tissues, but cause little damage.

Enw gwyddonol

Andricus quercuscalicis

Pryd i'w gweld

January to December

Top facts

Stats

Length of gall: up to 2.8cm
Introduced species.

Ynghylch

The knopper gall wasp, Andricus quercuscalicis, is a tiny wasp that produces ridged outgrowths, or 'galls', on the acorns of our native Pedunculate Oak; forming in August they are sticky and red, later becoming woody and brown. A second generation then develops in the catkins of Turkey Oak.

What to look for

The knopper gall wasp produces knobbly, bowl-shaped protrusions from acorns. They begin sticky and red, later turning brown.

Where to find

Widespread.

Roeddech chi yn gwybod?

Like most gall wasps, the lifecycle of the knopper gall wasp is complicated, with an alternation of a sexual and asexual generation each year.