This study focuses on the observation of changes in the demographic parameters of olive fly over time in two regions, Mitidja and Mezghana region, the method consists in identifying certain biotic and abiotic factors that can play a role on the variations of these parameters; on the other hand we tested new food attractiveness in a trapping method. The Results showed that the demographic parameters (emergence, parasitism and mortality) are influenced by the year and by the region factor with a very high emergence rate above 50%; On the other hand, the rate of parasitism remains low with a maximum value of 33.23% recorded in Mezghenna, regarding nymphal mortality the maximum value is recorded in Chebacheb with 26.44%. Furthermore, the study of the efficiency of nitrogen fertiliser (Urea 46 unit) on the catches of adults showed us that the best concentration of attraction is 6%; on the other hand, the yellow color of the traps positively influences the catches of Bactroceraoleae.
The population dynamics of the Olive Fruit Fly in the Tell Atlas has been studied for two years (May 2017-April 2019) on all phases of olive tree growth. The test was installed on an individual farm in the Mezghenna region. It is part of the ongoing work to assess the damage caused by the diptera Bactrocera oleae. The objective of this study is to collect information on adult flight and to calculate the population index (FTD) . On the other hand, we studied the annual variation of this last. The results of this study show that the olive fruit fly population fluctuates over time and from one period to another in the study area; Overall, we recorded a low density of Bactrocera oleae during the first year of study (less than 0.08 flies / trap / day). In addition, in the second year, we observed 3 population peaks concentrated in autumn and early spring; the high temperatures of summer have a negative effect on the density of the Diptere.
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