Galls, Diseases, and Pests - Two-horned Gall Wasp
Dryocosmus dubiosus
Dryocosmus dubiosus
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The Two-horned Gall Wasp females lay their eggs in the leaf veins on the underside of live oak leaves. As the galls grow, they apparently take nutrition from the leaf veins which sometimes causes the leaf tissue past the gall to die off. The "horns" on the gall develop after the eggs have hatched.
