Olive growing has got a long tradition on the coast, as written in numerous documents. There are about 20 known species of insects which can damage the olive tree and only some of them occur regularly and are considered economically important pests. The most important pests in the olive growing in Croatia are: the olive fuit fly (Bactrocera oleae Rossi), the olive moth (Prays oleae Bernard) and the olive curculio (Rhynchites cribripennis Desbrocheres). Somethimes they can cause significant economic damage, as yield reduction and poorer quality of the fruit and oil. The aim of this study was to determine the appearance dynamics of the olive curculio in his adult form and the appearance of the first and second generation of the olive moth and olive fruit fly. Based on the results, the optimal treatment will be determined. Monitoring of the population dynamics of these pests took place during 2016 in two olive groves in Pirovac and Grabovac. During the study, the population dynamics of the olive fruit fly was monitored by using yellow sticky boards "Rebell Amarillo" in combination with pheromone bait by "Witasek" company. The sampled fruits were examined under binocular magnifier to identify the presence of eggs, larvae and pupae of the olive fruit fly. Population dynamics of the olive moth was monitored by using pheromone traps by "Witasek " company. The sampled tassels were tested on the presence of olive moth caterpillars and by using 1m² wooden frame the number of the fallen fruits was recorded. The number of adult forms of the olive curculio was identified using the method of shedding branches. Olives were sampled and number of stabs was identified as well as the number of fallen fruits using 1 m² wooden frame. Weaker flight intensity of the olive fruit fly was recorded in July in both sites. The number has increased in the last decade of August, and in the first decade of September there was a maximum flight of the olive fruit fly which signalized the need for treatment against this pest in Pirovac olive groves. Related to what was said before, higher number of adult forms of the olive moth was recorded in Pirovac than in the olive grove in Grabovac. Later readings showed higher number of the olive moth in Grabovac and it lasted until the end of a second decade of May. The maximum flight for both sites was recorded in the third decade of June. The review of fringe in May showed that there was no infection of olive moth caterpillars, while in June there was only one caterpillar found at each localation while reviwing 100 fringes. During the three shedding of tree branches, Pirovac site did not contain the olive curculio, while in the groves of Grabovci, depending on the variety of olives, the presence of pests from 0.11 to 0.5 adult forms of olive curculio per branch was recorded. In July, the presence of pests was not noticed. While checking the fruits of the olives it was noticed that different sorts of olives were attacked diferently by the olive curculio.The smallest damage was noticed on sort Oblica (3%), and the largest damage on sort Chempresino (18%).