Home and food source for the oak apple gall wasp :
apple gall from www.wildlifetrusts.org
“Living up to its name, the oak apple gall wasp produces growths, or 'galls', on oak twigs that look like little apples. Inside the gall, the larvae of the wasp feed on the host tissues, but cause little damage.”
Interesting information. I've seen similar things, but really didn't know what they were. Not always on oak, so may be a different insect. The photo has nice textures and warm tones.
