Both work for swarm lure. The combination works best. They do not have exactly the same effect. I would use a piece 1/4 of the whole piece of the pseudo queen and four drops of lemongrass essential oil.
I'm talking about pseudo queen. It comes in little plastic tubes that are impregnated with QMP. The lure I would leave in the tube. Next time I would buy Lemongrass essential oil instead as that is what is in the tube anyway.
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