Fruit fly trap Proff is a biological trap that has been specially developed to combat fruit flies (Drosophila melanogaster), which are also called banana flies and vinegar flies. Fruit flies navigate primarily by their sense of smell, and like ordinary flies, they can only distinguish between light and dark. This makes it impossible for the fruit flies to find their way out of the trap again. The fruit fly trap can be set up in restaurants, canteens, kitchens, waste rooms and near areas with empty packaging, where the small fruit flies are often a nuisance. The trap is reusable and you can buy a refill for it.