Have you ever noticed grainy looking protuberances on the trunks of small rock sheoak trees? They belong to the caterpillar of a Cryptophasa species wood moth. They are also called hermit moths and Cryptophasa means ‘eating in private’ (scientists enjoy using cryptic language).
The caterpillar lives alone in a purely residential burrow in a tree branch that has a covering of silk, frass (a polite word for poo) and wood borings. At night it drags live needles into its burrow attaching them with silk to the entrance and munches away in safety. They pupate in the burrow and then emerge to mate.
The caterpillar of his particular species (?) is very attractive. I wonder what the moth looks like.
They don’t have much effect on the tree