you have vine weevil.... in adult form the just eat leaves, in grub like form they eat the roots of the plant. i lost alot from it this year and my dad (trained horticulturalist) said really the only thing to do is get rid of the soil.... now mine were in pots so im not sure how practical it would be for you to replace the soil of a whole bed but they will just eat everything. this may help you http://www.garden.ie/gardeningtroubles.aspx?id=651 good luck
No, true - pretty much sucks to be a vine weevil, eh?! I used some Provado earlier this year as my neighbour had a major infestation and I didn't want to wait for the nematodes to be delivered in case it spread further - the instructions were pretty terrifying! We're TTC and I spent the next week worrying that I had caused some terrible birth defects (but then AF arrived!).