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Oak Marbles, or Oak Apples | by davemac43
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Oak Marbles, or Oak Apples

the oak marble gall wasp ( andricus kollari ) injects an egg into the young bud of the oak tree ( quercus robur ). The tree defends itself by forming this "marble", this benifits the grub as it lives inside the gall until mature enough to emerge.

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Taken on September 18, 2012