In none of the low infested stands, where mass-trapping was applied to control M. feytaudi populations, the increment of larval density was lower than in control stand. Trap density was probably too low to catch a sufficient number of males to reduce the mating of a significant proportion of females. This indicate that mass-trapping should not be recommended to control Maritime pine bast scale populations
The pheromone mass-trapping system was not sufficient to suppress the number of P. citri males attracted, probably mostly from outside the subplot. By contrast the proportion of infested fruits by the Citrus mealybug was consistently higher in mass-trapping than in control subplots. It is then assumed that only a small part of the attracted males from outside the subplot are trapped, the remaining flyers contributing to increase the percentage of fecundated females and, consequently, to raise the infestation level. A promising tactic to manage Citrus mealybug could rely on the combination of mass-trapping within the Citrus orchard with chemical interventions selectively applied at the edge of the orchard, in order to prevent the adverse effect of male attraction from outside the plot.