I would love to know exactly what this little fella is! I first saw them about 8 years ago when they started turning up on some of my own bonsai. They don’t seem fussy about what they eat. I have found them on Pines, Larch, Yew, Juniper, Elms and Hawthorn. They wrap themselves up in old needles and anything else to hand and eat the cambium in a ring around the finer branches. This obviously results in dead branches.
I haven’t had them for two years now as I’m pretty regular with my spraying with Provado. However, today at Stephen house, we found them on his Yew and a Larch. The Yew had obviously been a victim of them for years and it must have had them when Stephen bought it last year.
If anyone knows what they are, I’d love to know.