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From: www.tiscali.co.uk/reference/
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insects

Insects - Oak Apple Insects - Oak Apple
Oak Apple
Diameter up to 25mm

Irregularly shaped buffish brown gall on oak caused by larva of gall wasp Biorhiza pallida. Adults emerge in June and July, each gall containing a single sex. Subsequent asexual generation develops in spherical galls on oak roots.