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There is also a wasp that will kill them. Essentially it lays it's eggs in the caterpillar and when they hatch, they eat it from the inside out.

http://www.pressofatlanticcity.com/life/green-thumbs-catalpa-sphinx-caterpillar-is-what-s-eating-reader/article_b1426696-912f-5d7b-95f1-9535aa06642c.html?mode=jqm This says that they are sporadic and there's no need to treat them.