Olive fruits of 4-6 mm in size were collected in the experimental olive orchard of the Institute for Adriatic Crops and Karst Reclamation at the beginning of June. An examination of the harvested fruits was carried out to determine the intensity of the attack of the carpophagous generation of olive moth (Prays oleae Bern). The composition of volatile substances of the fruits will be analyzed so that compounds characteristic for a specific variety and which could affect the attractiveness of the olive moth can be isolated.