Mass trapping has so far given results comparable to those of the chemical pest management test implemented with the protein bait and only if implemented on a large scale. It therefore pays for pest management programs in the area, while not offering excellent results if done at enterprise level, especially on limited foundations. In the 1970s, not yet having discovered the fly pheromone, mass trapping tests were carried out using yellow traps, but this technique, requiring the placement of at least five traps per plant, was discarded as uneconomic, and had a strong negative impact on useful entomofauna.