Jumping Oak Galls: The Hopping Gold Granules Under Oaks

Those Hopping Golden Pellets Are Wasp Galls

The golden, seed-like granules that jump around under your oaks are “jumping oak galls” made by tiny cynipid wasps. The wasp lays an egg in a leaf; the leaf forms a gall around it. In summer, the gall drops with the larva inside. The larva jerks, making the gall hop—likely seeking a soil crack to overwinter. It pupates, then emerges as an adult wasp.

No Harm, No Foul

• Galls rarely affect tree health.
• Natural enemies crash populations after 1–2 years.
• Heavy infestations may cause early leaf drop, but vigor is unaffected.
• No control needed—just enjoy the show.

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