Does anyone know the purpose of Balls on Oak trees? As kids we always called those ink balls because of the natural ink appearing fluid inside when cut open.
Balls on Oak Trees
- Thread starter SeniorCitizen
- Start date
Those are oak apples @SeniorCitizen, they are galls formed by a wasp that lays her eggs on a bud.
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- Apr 14, 2015
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- Location
- Inverness-shire, Scotland
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- 8a
- Country
You beat me to it @Tetters . 
This may be of help. The site is a bit slow in opening.
Oak gall wasps / RHS Gardening
This may be of help. The site is a bit slow in opening.
Oak gall wasps / RHS Gardening