2022-2023 emergence of Anterhynchium flavomarginatum

Standardized trap nests were used for the collection of A. flavomarginatum. Each trap nest consisted of a PVC tube (220 mm×110 mm, length×diameter) filled with 80±10 (SD) reed internodes (Arundo donax) of 20 cm length and diameters varying between 2 and 30 mm. Thus, each trap nest provided approximately 160 cavities for cavity-nesting Hymenoptera to establish nests. Trap nests were arranged in a west-to-east direction and every 50 m from a linear distance set a sampling plot, a total of 104 sampling plots. Traps were exposed in June 2022 and checked monthly for occupied nests until June 2024.