From its head shape hat looks like some kind of weevil. But from my (limited) knowledge, there are several types of the blighters that look similar - green immigrant leaf weevil? (waits for Daily Mail comments section...)
Thanks. It is likely to be a green nettle weevil as I just cut down loads of nettles arond the base of the tree. My theory was to let the random trees grow a bit and shade out the nettles but the weevils might eat everything before that happens.
From its head shape hat looks like some kind of weevil. But from my (limited) knowledge, there are several types of the blighters that look similar - green immigrant leaf weevil? (waits for Daily Mail comments section...)
No idea about killing them off, sorry.
Try here for ID, if you're inclined: http://www.eakringbirds.com/eakringbirds6/insectsphyllobiusweevils.htm - no treatment info either though