Horned oak gall are caused by wasps. The gall eventually causes a branch to drop to the ground. If the horns are gone, so is the wasp.
Horned oak gall are caused by wasps. The gall eventually causes a branch to drop to the ground. If the horns are gone, so is the wasp.
Horned oak gall are caused by wasps. The gall eventually causes a branch to drop to the ground. If the horns are gone, so is the wasp.

Gardening: Tiny wasps are causing galls on oak tree

August 27, 2015 4:00 AM

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