I have a huge easter lilly in my yard, I live in southeast georgia. It has these black with white rings caterpillar which has eaten the leaves up I don't know what it is or if it is a caterpillar or some kind of worm. They have move it another lilly that I have. They leave this black balls all linked together all over the plant. If anyone knows what this is and how to kill I would really appreciate it.

thank you

swampmama