Table 2.
Overview of H. halys egg masses exposed before parasitoid releases (“pre-release monitoring”), directly after releases within the release plot (“release”) and two weeks after releases (“post-release monitoring”).
| Exposure Date | Location | Treatment | Mean Temperature (Min – Max) [°C] | Egg Masses (Eggs) Exposed | Egg Masses (Eggs) Recovered 1 |
|---|---|---|---|---|---|
| 2016 | |||||
| 23.–28. Jul | 1 – Lindau | Pre-release monitoring | 22.4 (12.9–36.0) | 25 (657) | 22 (575) |
| 28. Jul – 2. Aug | Release | 21.7 (12.4–38.3) | 97 (2653) | 93 (2409) | |
| 11.–16. Aug | Post-release monitoring | 21.8 (9.6–36.6) | 55 (1480) | 54 (1459) | |
| 16.–21. Aug | Release | 20.4 (12.1–36.6) | 90 (2410) | 83 (2258) | |
| 2017 | |||||
| 17.–21. Jul | 1 – Lindau | Pre-release monitoring | 23.0 (13.8–34.5) | 25 (623) | 15 (298) |
| 29. Jul–3. Aug | Release | 23.2 (15.3–35.0) | 90 (2273) | 20 (479) | |
| 10.–17. Aug | Post-release monitoring | 18.8 (10.2–32.7) | 55 (1410) | 23 (562) | |
| 2.–10. Aug | 2 – Bellinzona | Pre-release monitoring | 23.4 (15.3–38.5) | 25 (637) | 20 (416) |
| 14.–21. Aug | Release | 23.1 (10.9–35.2) | 90 (2327) | 89 (1897) | |
| 28. Aug–4. Sep | Post-release monitoring | 21.2 (12.3–33.5) | 55 (1387) | 53 (774) | |
| 2018 | |||||
| 19.–25. Jul | 2 – Bellinzona | Pre-release monitoring | 25.0 (13.9–38.3) | 25 (685) | 22 (1371) |
| 25.–30. Jul | Release | 26.1 (15.5–37.9) | 90 (2418) | 90 (2205) | |
| 8.–13. Aug | Post-release monitoring | 23.7 (16.8–36.4) | 55 (2697) | 51 (1940) | |
| 19.–25. Jul | 4 – Carpi | Pre-release monitoring | 25.0 (16.0–35.0) | 25 (694) | 25 (363) |
| 25.–30. Jul | Release | 26.5 (17.0–36.5) | 90 (2392) | 82 (1780) | |
| 9.–14. Aug | Post-release monitoring | 25.4 (17.0–35.5) | 55 (1469) | 55 (958) | |
| 25.–30. Jul | 3 – Manno | Pre-release monitoring | 26.6 (15.3–44.5) | 25 (752) | 20 (545) |
| 30. Jul–3. Aug | Release | 28.0 (17.5–39.4) | 90 (2347) | 68 (957) | |
| 13.–17. Aug | Post-release monitoring | 23.1 (14.6–34.7) | 55 (1677) | 51 (1345) | |
| 6.–10. Aug | 1 – Lindau | Pre-release monitoring | Na | 25 (611) | 10 (58) |
| 11.–15. Aug | Release | Na | 90 (2303) | 85 (1026) | |
| 24.–28. Aug | Post-release monitoring | Na | 55 (1760) | 51 (1536) | |
| Total | 1287 (35,662) | 1082 (25,340) |
1 healthy looking eggs, neither collapsed nor predated on.