Those aren't eggs- they're the frass (poop) from the caterpillars. Just rinse it away. Since cabbage doesn't need to be pollinated, you could cover it with a very lightweight material (think sheer) loosley, but tucked under the pot on anchored to the ground to protect it from further infestations. You'll have to be diligent at first about cking it to be sure you didn't miss any eggs or small fry. Good luck!

Use a Bt spray to kill caterpillars and still maintain a "safe to eat" plant. Cabbage caterpilars are really hard to control any other way because they are green and fast growing. We quit growing all coles (cabbages, broc, etc) because they were so hard to control.

Thank you. I couldn't stand it and rinsed it off this morning before reading the responses. I subsequently found another caterpillar, but can't believe all that came from just one. The plant is looking much better since I've been watching it.

LOL- caterpillars produce and amazing amount of frass for their size! They are basically eating machines.