Re: Infos about butterfly-trees

[Bob Nienhuis]

stef wrote:

> Hello,
> a couple of trees near where i live (Stockholm, Sweden) have been
> invaded by what i assume to be butterfly larvas. I would like to get
> some infos about that. What kind of butterfly will it be? Is this
> common? Is this repeating itself each year?... Do they all "mutate"
> around the same time? Is it bad for the tree? ....
> Any info would be much appreciated :)
>
> ps: I posted some photos of the trees here:
> http://www.clumsybeats.org/larves.html
>
> Thank you

Look like North American tent caterpillers to me.
Somewhat distructive and a pest.

Bob