Citrus rust mite, Phyllocoptruta oleivora (Ashmead) (Acari: Phyllocoptidae), is one of the most important pests of citrus fruit trees. In this study, the population density of P. oleivora was carried out on an orange orchard at Çukurova University (Balcalı-Adana) between 2013 and 2015. Ten leaves, one fruit and one twig were collected from 10 randomly chosen orange trees. The samples were taken every week between April and January while biweekly between January and April. As a result of these studies, the first individuals were observed in June. The highest population of P. oleivora on leaves was counted as average 57.25 in August. The last individuals on leaves were detected in January both year. The highest population of this mite on fruits was observed in August. The last individuals on fruits were counted between October and November both years. The highest population on twigs was observed as average 72.13 in the first week of January. The population of P. oleivora on twigs was reduced after May. Also, the population of P. oleivora was increased after light rainy days while was decreased after very rainy and cold days. The overwintering sites P. oleivora was observed as a twig. Also, Amblyseius swirskii, Euseius scutalis and E. stipulatus Athias-Henriot (Acari: Phytoseiidae) was detected as predator mite during the study. The low population of predator mite was observed when the high population of P. oleivora was present. Turunçgil pas böcüsü, Phyllocoptruta oleivora (Ashmead) (Acari: Phyllocoptidae), nem oranının yüksek olduğu pek çok turunçgil bölgesinde, başta limon olmak üzere portakal ve altıntopun ana zararlılarından biri konumundadır (Garzia and Lillo 2018, Satar et al. 2013, Uygun and Satar 2008). Bu phyllocoptidin kökeninin Güneydoğu Asya olduğu