The Wilson® BUG-X® OUTTM Japanese Beetle Trap uses a dual lure to catch up to 75% of the beetles that come close to it. One component is an aromatic lure that attracts males and females, while the other is a female sex lure attracting males in large numbers. Place trap when adult Japanese beetles emerge, generally between early June and late August. Will work all season and catch up to 5 times more Japanese beetles than a product using an aromatic lure only.