Population dynamics and damage of Halyomorpha halys (Hemiptera: Pentatomidae) on Raspberry and Blueberry Plantations in Kosovo.

The brown marmorated stink bug, Halyomorpha halys Stål (Hemiptera: Pentatomidae), is a highly invasive and polyphagous pest causing substantial economic losses in agricultural systems worldwide. Although the species has been reported in neighboring countries, information regarding its occurrence and impact on berry production in Kosovo has been lacking. This study represents the first documented occurrence of H. halys in Kosovo and aimed to investigate its population dynamics, spatiotemporal distribution, and associated damage in raspberry and blueberry plantations over a 2-year period (2024 to 2025). Insect abundance was monitored using trap-based sampling, while crop damage was assessed through damage incidence and severity index evaluations at border and center locations within plantations. The results revealed clear temporal and spatial patterns in pest occurrence and crop damage. Population abundance and damage levels varied between years, crops, and sampling locations, indicating differences in host suitability and pest distribution within plantations. Higher pest pressure was generally associated with plantation borders, suggesting colonization from surrounding habitats. Overall, the findings confirm the successful establishment of H. halys in Kosovo and demonstrate its potential to affect berry production. These results highlight the importance of implementing monitoring programs and developing targeted management strategies, particularly in border areas, to reduce the impact of this invasive pest on berry crops.