DESCRIPTION: Caused by a gall wasp these succulent cherry-like growths can be 15 to 25 mm in diameter and appear smooth on Quercus robur or warty on Quercus petraea. The gall is yellow-green in colour with a varied amount of reddish tinting before becoming darker red then brown with a thick walled chamber. Singular galls are usually found but groups of up to half a dozen can occur. The gall is seen more often than the blackish gall wasp which emerges from fallen galls usually between late autumn and early spring. DISTRIBUTION: Widespread throughout Britain. HABITAT: Found on various varieties of Oak in the autumnal months.
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