The Oak Apple Gall is caused by a tiny gall wasp, Biorhiza pallida. It can be found between May and June on oak twigs where the female has laid her eggs in the leaf bud. Inside the gall there are a number of chambers, each housing a larva which eats its way out. Adults emerge in June and July.
How to identify
Unmistakeable: the Oak Apple Gall is a large, rough, buffish-brown, apple-like gall found on oak twigs.
Where to find it
When to find it
How can people help
The Wildlife Trusts manage many nature reserves for the benefit of all kinds of wildlife, from bugs to butterflies, fish to Foxes. But these precious sites are under threat from development, intensive agricultural practices and climate change. You can help by supporting your local Trust and becoming a member; you'll find out about exciting wildlife happenings, events on your doorstep and volunteering opportunities, and be helping local wildlife along the way.