How To Make Fruit Fly Traps
7. Add Dish Soap
Fruit flies are very small and light animals. As such, they can actually sit on top of liquids without breaking the surface tension and this will make the liquid far less effective at trapping them. The good news is that there is a way to overcome this problem, making the trap more effective at stopping the flies.
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Add a little dish soap into any liquid bait that you are using and this will instantly remove the surface tension. Fruit flies will then land on the liquid expecting to find that they will remain on the surface, only to find that they end up drowning in the liquid instead.
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