TY!!!Bacillus thuringiensis, a bacteria that kills cabbage worms, among other things. It's selective so it doesn't harm things like bees.
https://gardenerspath.com/how-to/organic/bacillus-thuringiensis/
I still have about a pint of BT mix in the sprayer. I'm going to use it on the brassicas again this evening, not because they need it but it's good only for 12 hours or so after mixing it with water.