If going organic then tweezers and a steady hand, or BT dust for a slower fix.

Yep all kinds of info here about using Bt ( bacillus thurigenesis) for them.
Dave

Better yet, row covers, but you have to get them on before the butterfly finds the plants.

Tweezers? I just smash 'em w/ my fingers...

Me too Carol, just being diplomatic ;)

Odd as this may sound, for catapilers in general I'll allow some wasps nests to exist in safe areas around the homestead. The wasps are excellent cat hunters and patrol to pick them off of my cole crops, corn silks, asparagus ferns, etc. Wasps are tame enough (not hornets) and can be manageable in out of the way spots.

Excellent point vgkg. We tend to forget how beneficial wasps can be around the garden.

Dave

Yes, I have lots of wasps patrolling my cabbage too, so they are welcome in my garden. Years ago I was afraid of them, but not any more. I'll be in the garden and they will be flying around me, sometimes a few inches away. The only time I was stung was a couple years ago when I reached out and grabbed a leaf, not realizing there was one underneath. But otherwise they leave me alone.

Funny right... In the dinosaur movies we usually root for the plant eaters.

ccabal, that's because in those movies people are the meat.