Galls, Diseases, and Pests - Clustered Gall Wasp
Andricus brunneus
These galls grow out of the leaf's midrib vein.
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This shows the range of sizes and colors in the galls.
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Other times, the colors and sizes are very similar.
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Regardless of the size of the galls, they end up in a balloon shape as they grow against each other.
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The other galls in this cluster have fallen off the leaf, giving a good view of the shape of the remaining gall.
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The wasp in this photo and the next few is likely an Andricus brunneus wasp, the type that creates these galls.
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