My guess: flea beetles.

They have their preferences. I have kohlrabi and cabbage within 6 feet of the radish. I see no damage to anything except the radish in that garden.

Elsewhere, they chew up a Wrapped-heart mustard while almost leaving the Southern Giant alone. Beat the tar out of the bok choy in the full sun but leave the bok choy that gets any shade at all, untouched.

The flea beetles also have preference for some varieties of tomato plants over others. I have even noticed how they will eat on the green stripes of Tigerella tomatoes but not on the red stripes!

Anyway, I think the problem is flea beetles. Check the extension service about what you can or should do about them. Spinosad is supposed to be effective but up to this year, I've used pyrethrum/rotenone - new to spinosad.

Steve

Thanks Steve, I'll do some reading on flea beetles!