The olive fruit fly (Bactrocera oleae) is one of the most important pests of the olive fruits. Studies show that the quality of olive oil extracted from different varieties vary in different levels of infestation. The present study was carried out on some commercial varieties of olive (including, Roghani, Zard, Arbequina, Mari and Kroniki) at Roudbar olive Research Station in 2016. After harvesting, fruits of each variety were classified into two groups of healthy and infested groups. To include various infestation levels, treatments with 0, 10, 20, 40, and 80% were prepared manually and used for analyzing and determining the quality parameters of olive oil including oil percentage, oleic acid, peroxide value, acidity, and total phenol. The results showed that in the most contaminated sample (80%), oleic acid and peroxide value were in standard limit in all olive varieties. The acidity percentage of the samples with 10% of infestation in the varieties of Arbequina, Roghani, Zard, Mari and Kroniki were 1.71, 1.53, 1.69, 1.52, and 1.79 respectively. Also, reduction of the amount of total phenol and oil percentage in the samples with 10% infestation, comparing to non-infested subjects in varieties of Arbequina, Roghani, Zard, Mari and Kroniki were 6, 5.3, 9.6, 8.9, 4.9 and 3.2, 3, 5.3, 3.6, 4.2 respectively. It could be concluded (without considering of acidity) that in Zard, Mari, Arbequine, Roghani and Kroniki varieties up to 10% of infestation is tolerable. |