Another yellow attractant that might be easier than the yellow bucket method is sticky traps or fly strips. I got yellow card sticky traps at the hardware store and I catch LOTS of bugs with those. Be careful though, they're very sticky. I hung one up near my orchids to catch thrips and accidentally got my hair stuck to it one day. Luckily my husband was nearby and came to free me.
As stone commented, as long as the beetles aren't defoliating your passion vine they can survive quite a lot of munching. They are a major butterfly host down here so they get chewed a lot by caterpillars from time to time. Always recover nicely. They're lusty, vigorous growing plants.
