| Oak Apple |
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An oak apple is a mutation of an Oak leaf caused by chemicals injected by the larvae of certain kinds of Gall Wasp . They are so called because the Gall , which can measure up to 5cm in diameter but is normally only around 2cm, looks a little like an apple. European oak apples are caused by the ''Biorhiza pallida'' gall wasp and American oak apples by ''Amphibolips confluenta''. Oxford English Dictionary Oak apples may be brownish or reddish. NOTES SEE ALSO Oak Apple Day EXTERNAL LINKS
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