Passion Vine Caterpillars: Gulf Fritillary Symbiosis

Big orange and black caterpillars eating passion fruit plant—practically killed it. Dish soap/veg oil didn't work. "Seven" worked 10 days, now back with vengeance. Suggestions?

Expert Advice

Those are Gulf Fritillary butterfly caterpillars—their host plant is passion vine. It's a symbiotic relationship: the plant won't die from chewing, just looks bad. After they pupate, the plant recovers and thrives. Eradication is nearly impossible; best to let nature take its course.

Nick