Table 2.
Number of egg masses (N. EM) and eggs (N. E) for Halyomorpha halys collected in the different survey areas (methods a and b), showing percentage of parasitized egg masses (PEM) and parasitized eggs (PE), and resulting parasitism rate (PR) for Trissolcus japonicus (A), Trissolcus mitsukurii (B) and Anastatus bifasciatus (C), calculated on egg masses from which only one parasitoid species had emerged.
| A. Trissolcus japonicus | ||||||
| Country | Region/Canton | N. EM | N. E | PEM (%) | PE (%) | PR (Mean ± SE) |
| Italy | Piedmont | 1788 | 46,824 | 4.03 | 2.98 | 89.43 ± 2.97 |
| Veneto | 669 | 16,966 | 0.45 | 0.29 | 100.00 ± 0.00 | |
| Switzerland | Basel | 26 | 625 | 53.85 | 50.88 | 80.25 ± 6.95 |
| Zürich | 25 | 673 | 32.00 | 25.41 | 71.43 ± 10.19 | |
| B. Trissolcus mitsukurii | ||||||
| Country | Region/Canton | N. EM | N. E | PEM (%) | PE (%) | PR (Mean ± SE) |
| Italy | Emilia Romagna | 629 | 16,707 | 3.66 | 2.75 | 97.40 ± 1.68 |
| Friuli-Venezia Giulia | 589 | 13,874 | 20.20 | 14.49 | 96.21 ± 1.38 | |
| Piedmont | 1788 | 46,824 | 0.17 | 0.09 | 91.23 ± 8.77 | |
| Trentino-Alto Adige | 585 | 15,506 | 5.98 | 4.15 | 96.70 ± 2.92 | |
| Veneto | 669 | 16,966 | 6.88 | 4.66 | 88.59 ± 3.27 | |
| C. Anastatus bifasciatus | ||||||
| Country | Region/Canton | N. EM | N. E | PEM (%) | PE (%) | PR (Mean ± SE) |
| Italy | Emilia Romagna | 629 | 16,707 | 19.55 | 2.36 | 66.06 ± 2.78 |
| Friuli-Venezia Giulia | 589 | 13,874 | 0.85 | 0.35 | 44.89 ± 19.54 | |
| Piedmont | 1788 | 46,824 | 15.72 | 7.79 | 73.97 ± 1.92 | |
| Trentino-Alto Adige | 585 | 15,506 | 11.97 | 5.62 | 76.09 ± 3.69 | |
| Veneto | 669 | 16,966 | 1.05 | 0.62 | 68.32 ± 15.15 | |
| Switzerland | Basel | 26 | 625 | 3.85 | 3.36 | 75.00 |
| Zürich | 25 | 673 | 4.00 | 0.15 | 3.57 | |