I'm gonna say it's caterpillar poop.

Yep: caterpillar poop.

Agree. That's poop from a cabbage worm. Look for a white butterfly flittering around.

Rodney

Oh gross. I didn't recognize that caterpillar, so I guess radish is the first thing I ever grew that attracted that nasty beast. I decided to take them out for now (they were full of holes and yellowing anyway). We got to eat about 5. I will try again for at the end of the season. For now, I stuck a new zuke in it's spot there to transplant later, in my 2014 war against SVBs :). Bugs bugs bugs.
Thanks!!!

Caterpillars don't lay eggs, the butterflies do and then they become caterpillars.
So what you see is just poop. hehe

I know!! I thought the caterpillar I saw was a result of an egg hatching!
I pluck off all of the eggs from the kind that eat the basil and parsley (the butterflies are black/blue and beautiful and make a pretty darned cool looking caterpillar). Those hatch and turn into little suckers quickly! I just thought this was some unknown version!