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An x-ray of an Oak Gall

An x-ray of a common gall effecting oak trees, Quercus sp. This gall is sometimes called Oak-apples. A gall is an abnormal growth or swelling formed by a plant as a result of attack by parasites such as bacteria, fungi, nematodes, insects and mites. These galls are caused by larvae of parasitic wasps. Oak- apples are valued for the high-content of tannin within them.

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Filename: oak-gallblue.jpg
Copyright: Ted Kinsman / Science Source Inc.
Image Size: 5635x6348 / 6.4MB; radiograph radiographs x-ray ray rays x-rays xray xrays x ray x rays disease diseases gall nature oak tree oak-apples quercus sp.
Contained in galleries: X-Rays

An x-ray of a common gall effecting oak trees, Quercus sp. This gall is sometimes called Oak-apples. A gall is an abnormal growth or swelling formed by a plant as a result of attack by parasites such as bacteria, fungi, nematodes, insects and mites. These galls are caused by larvae of parasitic wasps. Oak- apples are valued for the high-content of tannin within them.