Fruit Fly’s are particularly attracted to again fruit as it begins to spoil. Keen sense of smell, they detect and follow the scent of the gases emit the process. For this reason, baits that work particularly well are:
Be sure to clean any potential open food source before you set up a trap in a kitchen, dispose of any food going bad, and ensure your wast areas and drains are clean. In a restaurant or bar cleaning the areas around taps, bar mats or even drainage lines may be necessary. Any damp areas should also be removed.
Fruit Fly’s can potentially be well fed and not interested in finding a food source. If the trap does not work immediately, be patient. Keep at it.