Sorry to hear about your aphid problem. That always sucks when your plants are doing great, then the bugs hit. Everyone's situation is different, though I see two options. Either use organic pesticides, or beneficial insects. But not both!!! Organic pesticides kill beneficial insects also, they don't discriminate. Because you are growing in a greenhouse and are dealing with aphids, I would close off any openings with screening (shade cloth, screen door screen etc.). Then introduce a swarm of ladybugs into the greenhouse. Also cut off (and get rid of) any leaves that are heavily infested.
P.S. I wouldn't do anything to attract the aphids, they wont be that easy to lure away. Trying to attract them somewhere else from the greenhouse will likely just do the opposite and attract them in from the surrounding area. Either way, if there happy in the green house, they wont be going anywhere (at least not faster than they breed) and that won't help.
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