I'm a newbie gardener with a very newbie garden (when I moved in last year, the yard was overrun with litter and weeds). I put in a small vegetable and herb garden, and a small flower garden. Everything seems to be doing well, but this morning I noticed that all the leaves of my radishes have been chewed through, and the leaves that are left have dark green bumps and small green caterpillars on them. I'm trying to be as nature-friendly as possible, and I don't want to kill anything that could be benign or even useful in the garden. What category are these little caterpillars in? So far it looks like the radishes are the only things they've attacked, but are my other plants next? And if I should get rid of them, what's the best way?
Thanks for your help!