What's eating my willow ?

I've removed some of the effected branches what are they and how can i get rid of them before they destroy the tree? The plaid try is in a pot and other wise very happy. I am hoping its not the bugs that stripped my gooseberries last year ??
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Willow Sawfly.
http://www.gardenersworld.com/forum/thread/?threadId=80455
Thanks Alan