| Autor: |
Duan, Jian J, Schmude, Jonathan M, Petrice, Toby R, Bauer, Leah S, Poland, Therese M, Chandler, Jennifer L, Crandall, Ryan, Elkinton, Joseph S, Van Driesche, Roy |
| Zdroj: |
Journal of Economic Entomology; October 2023, Vol. 116 Issue: 5 p1518-1528, 11p |
| Abstrakt: |
Spathius galinaeis a larval parasitoid native to the Russian Far East that was approved for release in the United States in 2015 for biological control of the emerald ash borer (EAB), Agrilus planipennis, an invasive beetle from Asia responsible for widespread mortality of ash trees (Fraxinusspp.) in North America. From 2015 to 2017, 1,340–1,445 females of S. galinaealong with males were released into each release plot, paired with a nonrelease control plot (1–12.5 km apart), at 6 postinvasion forested sites containing abundant pole-sized ash trees in Michigan. By 2018, S. galinaehad spread to all but one control plot. Based on the first year that S. galinaewas found in trees in each control plot and the distances of those trees to the parasitoid release point within each site, we estimated that S. galinaespread at 3.7 (±1.9) km per year after its initial releases in 2015. The proportion of sampled trees with S. galinaebroods, brood densities within sampled trees, and parasitism of EAB larvae increased sharply in both control and release plots after the last field releases in 2017, with the highest parasitism rates (42.8–60.3%) in 2020. Life table analysis showed that S. galinaealone reduced EAB’s net population growth rate by 35–55% across sites from 2018 to 2020. These results demonstrate that S. galinaehas established an increasing population in Michigan and now plays a significant role in reducing EAB populations in the area. |
| Databáze: |
Supplemental Index |
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