About Gall Wasps

Gall wasps are tiny wasps, as small as 1mm in length, with many species across the United States. Specific species attack specific trees, i.e. the erythrina gall wasp on Wili Wili trees in HI. Most known gall wasps, however, attack oak trees. The wasp lays its eggs in the plant tissue which creates a “gall,” or abnormal growth, where the eggs were deposited. The larvae live and feed inside the gall. Generally, the galls are more an eyesore than a threat to the tree. Galls can form on leaves, stems, twigs, buds and roots. One of the more common is the oak gall wasp which forms spherical galls on the leaves.

Treatments for Gall Wasps

Trees with Gall Wasp can be treated with: IMA-jet.

Learn More About Common Tree Pests & Treatments

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