University of Guilan Caspian Journal of Environmental Sciences 1735-3033 24 2 2026 04 01 Developmental characteristics of the brown marmorated stink bug, Halyomorpha halys, under the conditions of Southeastern Kazakhstan 425 432 9632 10.22124/cjes.2026.9632 EN Gulnaz Zh. Mengdibayeva LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Nurzhan S. Mukhamadiyev LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Nurbakyt D. Kurmangaliyeva LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Nurgeldi T. Kenes LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Yelshat Dauletkeldi LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Assel M. Seitzhan LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Azamat S. Shakerov LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Nurlan Akbayev LLP "Kazakh Research Institute of Plant Protection and Quarantine named after Zh. Zhiembayev", Almaty, Kazakhstan Kanat Anuarbekov Kazakh National Agrarian Research University, Almaty, Kazakhstan Journal Article 2026 05 22 The article presents the results of studies on the developmental biology of the brown marmorated stink bug, <em>Halyomorpha halys</em> on agricultural, ornamental, and forest plants under the conditions of Almaty City and Almaty Region in 2024-2025. It was established that overwintered populations in Almaty City appear during the second decade of May to June, whereas in the Almaty Region they emerge in the third decade of May. The first generation was formed in June, the second in July-August, and the third in August; adults entered diapause from late October. The duration of larval (nymphal) development differed among parts of the Almaty Region (Talgar District, Tuzdybastau village, and Enbekshikazak District, Turgen village): developmental stages occurred later and were characterized by different values of the sum of effective temperatures (SET) compared to Almaty City. Despite these differences, two generations were observed in both regions in 2024 and three generations in 2025. A gradual increase in SET from early to later nymphal instars was recorded, reflecting the adaptive plasticity of the species to regional climatic conditions. https://cjes.guilan.ac.ir/article_9632_554726d4cd8f99a7f865052024687cd3.pdf