Acarological Society of Iran Persian Journal of Acarology 2251-8169 9 3 2026 01 01 First finding of Pentamerismus oregonensisand its abundance (Acari:Tenuipal-pidae) on juniper trees in Kyiv, Ukraine 299 301 239247 10.22073/pja.v9i3.60667 EN Lesia Bondareva FacultyofPlantprotection, BiotechnologyandEcology, National University of Life and Environmental Sciences, Kyiv, Ukraine;E-mail:lnubip69@gmail.com Piotr Chumak Polissia National University, Zhytomyr, Ukraine; E-mail: Chumakp@i.ua Journal Article In 2018, the flat—mite <em>Pentamerismus oregonensis</em> was first discovered on juniper in Kyiv Botanical Gardens and parks (McGregor 1949). This is the northernmost border (50–27 'N and 30–30' E) of the species discovery in Ukraine. Observations of the pest development indicate that the number of mites reaches the highest point in August, then it gradually decreases and single individuals are recorded in September. In the conditions of Kyiv, the mite develops in one generation. Among the studied forage plants of <em>P. oregonensis</em>, its greatest number was observed on <em>Juniperus sabina</em> L. (3.6 ind./leaf), as well as <em>J. communis</em> L. and <em>J. oblonga</em> Bieb. (1.3 - 1.2 ind./leaf.) https://www.persianacarology.org/article_239247_41e8997b81e6b1ead08d0a2278d6a256.pdf