Department of Entomology, National Chung Hsing University, Taichung City, Taiwan, Republic of China.
Department of Entomology, University of California, Riverside, CA, USA.
J Econ Entomol. 2022 Feb 9;115(1):116-123. doi: 10.1093/jee/toab232.
Species belonging to the Euwallacea fornicatus Eichhoff (Coleoptera: Scolytinae) species complex have invaded the continental U.S. since at least 2003. Three species of this complex are known to have established, two in California (E. fornicatus; and Euwallacea kuroshio), and a third in Florida (Euwallacea perbrevis). Their native ranges are spread across southern and southeast Asia. In Taiwan, all three species occur in sympatry. They attack healthy trees of widely varied species and cause severe damage and death to the trees. The attractant quercivorol is commonly used to promote their detection by passive trapping. Recent studies in Florida have shown that trapping of E. perbrevis can be further improved by adding a synergist, α-copaene, alongside the quercivorol lure. Thus, we were interested in testing the effectiveness of α-copaene for trapping the other invasive members of the complex in California and in an area of Taiwan where all three species co-occur. We found that α-copaene marginally enhanced the trapping of E. perbrevis in Taiwan, but had no effect on the trapping of E. fornicatus or E. kuroshio in either California or Taiwan. We conclude that any enhancing effect of α-copaene is specific to E. perbrevis. This highlights the economic importance of accurate species identification in developing and implementing an efficient, and yet cost-effective, monitoring program for the management of E. fornicatus and E. kuroshio in California and elsewhere.
自 2003 年以来，隶属于 Euwallacea fornicatus Eichhoff（鞘翅目：象甲科）种复合体的物种已经入侵了美国大陆。已知该复合体中的三个物种已经建立了种群，两个在加利福尼亚（E. fornicatus 和 Euwallacea kuroshio），第三个在佛罗里达州（Euwallacea perbrevis）。它们的原生范围分布在南亚和东南亚。在台湾，这三个物种同时存在于同一地区。它们攻击健康的各种树木，并对树木造成严重的破坏和死亡。栎醇是一种常见的引诱剂，用于促进其被动诱捕。最近在佛罗里达州的研究表明，在栎醇诱捕剂中添加协同剂α-罗勒烯，可以进一步提高对 E. perbrevis 的诱捕效果。因此，我们有兴趣测试α-罗勒烯对加利福尼亚州和台湾一个同时存在这三个物种地区的复合体中其他入侵成员的诱捕效果。我们发现，α-罗勒烯略微提高了在台湾对 E. perbrevis 的诱捕效果，但对加利福尼亚或台湾的 E. fornicatus 或 E. kuroshio 的诱捕没有影响。我们得出结论，α-罗勒烯的任何增强效果都是针对 E. perbrevis 的。这突出了在制定和实施有效的、具有成本效益的监测计划以管理加利福尼亚州和其他地方的 E. fornicatus 和 E. kuroshio 时，准确识别物种的经济重要性。
