That looks like caterpillar poop (frass) to me. Try some BT.

The damage is being caused by cabbage worms or loopers. That green stuff is poop. You've captured the culprit in the picture. It's on the left side next to the stem.

Rodney

Thank you both very much! I just didn't see the culprit as I was concentrating so hard on the eggs.

It looks like BT is the answer. I've learned something. Just hope I can get to the shop in time - they work so fast.

As the others mentioned, the green stuff is the larvas poop, not eggs.

If you only have a few plants you don't need to spray bt, just find the larva and squash them. Once you know what to look for, they're easy to spot and kill.

-Mark

The next time, cover them wit nylone tulle. The white butterflies lay the eggs. I learned after my cabbages were destroyed.

Of all the butterflies , I dislike those white ones. Ghirrrr !