The official monitoring network (trapping) of the NCFF was used to capture adult fruit flies.
To determine the behavior of the population of each species of fruit fly and its plant health category according to the NCFF, the fruit flies per trap per d (FTD) index was employed, using weekly abundance data, following the equation F/T*D, where F represents the number of fruit flies trapped in the exposure period of the trap, T the number of traps inspected in the period, and D the number of d that the traps were exposed in the field.
The sites where NCFF traps were established did not allow the detection of a higher diversity of species owing to the reduced number of alternative hosts near commercial orchards.
This means that the NCFF must apply several control strategies, such as chemical, cultural, and biological control (IPM), if fruit fly populations are to be controlled.
According to the Mexican Plant Protection Standard NOM-023-FITO-1995 (SAGAR 1999), the incidence levels of these 4 fruit fly species are used to define the plant protection zones or categories that have been established for the NCFF, namely Free Zone with FTD = 0.00; Zone of Low Prevalence (with FTD < 0.01; and Zones under Plant Protection Actions (FTD > 0.01, with an upper limit of > 0.08); management strategies proposed by the NCFF are carried out taking these categories into account.