|Oak Currant Gall, Woking Palace 12th May 2014|
The male and female wasps emerge in June from the Currant Galls, and after mating the female lays fertilised eggs on the underside of Oak leaves these develop over the winter into the Spangle Galls. Wasps emerge from the Spangle Galls in April and the cycle starts all over again.
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As Samuel Pepys recorded in his Diary, in 1660, Parliament declared 29th May a Day of Thanksgiving, a public holiday:
"Parliament had ordered the 29 of May, the King's birthday, to be for ever kept as a day of thanksgiving for our redemption from tyranny and the King's return to his Government, he entering London that day."http://www.british-history.ac.uk/report.aspx?compid=26202#s3
Oak Apple Day was formally abolished in 1859. The cynipid wasps still seem to be thriving.