What's Happening to this Ivy?

What's Happening to this Ivy?

Observation - What's Happening to this Ivy? - UK and Ireland. Description: From a distance, looks as if someone has thrown white paint at the ivy climbing the trunk of a tree. Closer inspection - white, skin-like flakes and sheets of what looks like crumpled tissue paper - and holes. I'm guessing some kind of insect is causin

From a distance, looks as if someone has thrown white paint at the ivy climbing the trunk of a tree. Closer inspection - white, skin-like flakes and sheets of what looks like crumpled tissue paper - and holes.

I'm guessing some kind of insect is causing this - hence putting it in the invertebrate section. Anyone know what insect?