Abstract
Halyomorpha halys (STÅL, 1855) is considered an agricultural pest worldwide, in South Tyrol especially in
apple cultivation. The exotic parasitoids Trissolcus japonicus (ASHMEAD, 1904) and T. mitsukurii (ASHMEAD, 1904) were detected in South Tyrol a couple of years after the first occurrence of their host. Three apple orchard-hedge ecotones, consisting of a hedge and the first few rows of the orchard, and three semi-natural sites were studied using visual controls, yellow pan traps, Malaise traps, sweep netting and beating. The purpose was to examine the distribution and abundance of phytophagous true bugs and parasitoids, especially of exotic species. For the 47thmeeting of the “Arbeitsgruppe Mitteleuropäischer Heteropterologen” in Bozen, the presentation was limited to the true bug fauna, with special focus on the superfamilies Pentatomoidea and Coreoidea. Results indicated Nezara viridula (LINNAEUS, 1758) and Palomena prasina (LINNAEUS, 1761) to be more abundant than H. halys in apple orchard-hedge ecotones. As a result, the potential of these species as pests tended to be greater in the studied apple orchard margins. Halyomorpha halys was not found to be numerous in semi-natural sites. However, these sites were found to be a suitable habitat for many other true bug species belonging to the superfamilies Pentatomoidea and Coreoidea.