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Insect Galls

Oak Leaf Seed Galls Releasing Wasps

One of the most unusual looking insect galls, the Oak Leaf Seed Gall, is produced by a tiny gall wasp, Dryocosmus deciduus, on Black and Red Oaks. The leaves of these trees react to a wasp laying an egg on them by creating a unique swelling, or gall, around it. You can find clusters of up to 40 Oak Leaf Seed Galls at this time of year starting to burst open, releasing the adult wasps which have matured inside them.

Few records exist of galls, many of which are homes for developing young insects, being used as food for humans or for domestic animals but Oak Leaf Seed Galls, known as “black oak wheat” in Missouri and Arkansas, have been used to fatten cattle, sheep, pigs and chickens due to their high starch content.

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