I asked the same question about two months ago. Micheal Bush answered: "One to four drops would be the range I would use. I usually shoot for three drops in the center of the center top bar (if I have frames in the trap)." He also said that he would check about once a month and that if he can smell the lemon grass oil, he figures it doesn't need any more for a while. Do a search for "lemongrass oil".
May depend on the oil? I bought some(a dram) that worked very well and used it all. I bought some more(an ounce, for the same money) from a different source. It seemed "watered down" and didn't smell quite the same. It hasn't worked very well at all. In all fairness, the swarm season may very well be mostly behind us out here, and i will reserve judgement until this time next year. Although with the record rainfall we had this last winter, it may not be a fair comparison at all. For what that's worth. jim
Its not a real big deal how much lemongrass oil you use. Actually, more lemongrass oil will have better results as the scent can travel further. I one added an ounce or a bit more of lemongrass oil to one cup of melted bees wax. I painted this hot wax inside, around the entrance of 15 traps. The bees went crazy over the scent. The heat of the sun may have released more scent each day when the wax softened.
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