Slugs will eat cornmeal, even though it kills them. Put cornmeal in a jar turned on its side near the affected plants...!!!
Make a 50/50 combination of flour and baking soda, and dust it all over whichever plants the cabbage worms are eating. They'll eat the combo while munching the leaves, and die within a day or so. Repeat as necessary..
Rustic Cabin in the woods at winter! Love this porch