Ok, if you already know it is a catalpa worm, then it is NOT poisonous, OR venomous. 'Poisonous' means something is toxic if it is ingested (eaten). 'Venomous' means its bite or sting is dangerous. Catalpa worms eat ONLY catalpa, so it won't eat if it is not on that tree.

Are catalpa worms harmful?

In a single summer, 3-4 generations can occur, lucky for my father and I using them as bait but unlucky for the tree. Indeed, the Catalpa worms are vicious predators and can kill off an entire tree by consuming all the leaves.

How often do catalpa worms come out?

All of these baits have their place and time on a hook, but few rival a natural seasonal bait that shows up in Arkansas in mid-summer: the catalpa worm. The catalpa worm is found only on catalpa trees and typically appears in late June or early July for about two to three weeks.