What is eating my avacado ?
This was grown from seed this summer in the greenhouse but brought inside over winter.
What could be doing this and how can I stop it?
Have you looked for weevils? They are a common greenhouse pest.
Do you have a cat? They sometimes decide to have a munch on a leaf.
The pattern of eating doesn't look quite right for a vine weevil, they usually start from the edges and work in. You could also check for a tiny slug or snail, small ones don't leave as much of a slime trail..