Catapillars eating Dutchman's Pipe

tonight I pulled no less than 50 catapillars off the Dutchman's Pipe. This vine has been here for nearly 40 years. I've never seen these catapillars before. they are black with tiny orange spots on the back and they are rather plump. the droppings were quite a mess as well. I am afraid they will destroy the vine. what should I treat with? I have house plants on the porch and they are not far.
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