Posted: 04/04/2015 at 20:35
It sounds like dreaded Vine weevil larvae. Do they curl-up into a C shape?
Here are some images of Vine weevil grubs:
If it is those, and because it it is an edible crop, your only safe choice is nematodes, which are safe to use on food crops. Google "Nemasys Vine Weevil Killer". When I get a bad infestation, I turn all of the soil out of the pots or containers onto a large sheet of weed membrane or tarpaulin and let the birds pick over it, and they have a feast!
Unfortunately, it is probably too late to save your plants but a dose of nematodes in all of your pots and containers will protect any new plants you grow.