Knopper Galls

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Knopper galls look a bit like a lump of popcorn.  When they first form in August, they're a green colour with a reddish blush, and are sticky to the touch.  Later they turn brown and woody.  They're caused by the tiny gall wasp Andricus quercuscalicis, which lays its eggs in the acorn.

Knopper galls have rapidly become widespread in the U.K. since they first appeared in about 1960.  Some years they can have a negative effect on the acorn crop.  The trees most affected are generally in close proximity Turkey Oak Trees.

Related Pages

• UK Safari Galls Section
• Identify other wildlife
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