Taken very seriously in the UK. Here in Belgium they don't seem to bother much, it's left up to each person to deal with it as he thinks fit. My friend had them on his plot last year, he just goes around squashing them. He also killed lots of ladybird larva thinking it was colorado!
Here's a couple of pics of the ones from his plot, thankfully his plot is a long way from mine!
Pic 1 is larva, pic 2 is the beetle. Sorry about the focus.
![](http://img.photobucket.com/albums/v299/Kenkew/42ColoradoJune04.jpg)
![](http://img.photobucket.com/albums/v299/Kenkew/019ColoradoAug04.jpg)