When they swarm your windows, a quick vacuum works best—no zap, no sweat, and they still end up gone.
Recent entomology studies show daylight spectrum attracts Asian beetles way more than UV. So zapper lights are basically invisible to them.
I use a layer of defense: vacuum, natural repellents like citrus oil, and physical exclusion. That combo cleared them out within a week.
Zappers target nuisance bugs, sure, but they also wipe out beneficials. For Asian beetles, I’d stick with non-lethal methods first.
Meanwhile, LED light traps tuned to starry tones seem to catch some night-flying Asian beetles. Still experimental, but promising.
Zappers may catch a beetle here or there, but for real control, combine removal, exclusion, and be mindful of nontarget insects.