I bought some swarm lure from a Apiary, that makes and sells it. I opened the vial. It smelled like Lemongrass Oil. I opened a envelope of swarm lure, from one of the major suppliers, and it smelled of lemongrass oil, too. I called both of them, and asked them if that is what it was. The envelope had 2 vials, and the other one had the pheromone in it. The other stuff, is mixed together, form the Apiary. I am going to look at this real close. I may not be using anything but Lemongrass oil, in the future.