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Captive sentinel hosts efficiently measure the establishment, seasonality and dispersal of a parasitoid biological control agent
Journal of Pest Science ( IF 4.8 ) Pub Date : 2020-11-26 , DOI: 10.1007/s10340-020-01300-z
Scott Hardwick , Craig B. Phillips

Introduced biological control agents are used to suppress populations and reduce the damage caused by many exotic herbivorous insects in New Zealand pasture. Understanding the dispersal behaviour of a recently introduced biocontrol agent in its new environment is important as it helps biocontrol practitioners make decisions on the number and location of future releases. In this study, a monitoring device which contained sentinel hosts was developed to monitor the establishment and dispersal of the Irish strain of Microctonus aethiopoides (Hymenoptera, Braconidae) into areas of the South Island of New Zealand where the clover pest Sitona obsoletus Gmelin (Coleoptera, Curculionidae) had recently become established. Field tests of the monitoring device at five sites in Marlborough confirmed that M. aethiopoides would enter the device through a 900 µm mesh and parasitise the sentinel weevils within. In a further trial conducted over 4 years at four sites in North Canterbury, monitoring devices successfully tracked the dispersal and establishment of M. aethiopoides at sites up to 27 km from the original release site. Monitoring devices containing sentinel hosts may help reduce the cost of classical biological control programmes as they enable rapid sampling of numerous sites and largely eliminate the time consuming practice of dissecting field collected hosts to determine the presence of the parasitoid.



中文翻译:

囚禁哨兵主机可有效地测量拟寄生生物防治剂的建立,季节性和扩散

引入的生物防治剂可用于抑制种群并减少新西兰牧场中许多外来草食性昆虫引起的破坏。了解新近引入的生物防治剂在新环境中的扩散行为非常重要,因为它有助于生物防治从业者对未来释放的数量和位置做出决策。在这项研究中,开发了一种包含前哨宿主的监测装置,以监测爱尔兰细小拟南芥(Hymenoptera,Braconidae)爱尔兰菌株的建立和传播到三叶草害虫Stonona obsoletus的新西兰南岛地区Gmelin(鞘翅目,Curculionidae)最近成立。在Marlborough的五个地点对监视设备进行的现场测试证实,aethiopoides可以通过900 µm筛孔进入设备,并寄生在其中的前哨象鼻虫。在北坎特伯雷的四个地点进行的为期4年的进一步试验中,监控设备成功地追踪了拟南芥的扩散和建立,该地点距原始释放地点不超过27公里。包含前哨宿主的监视设备可以帮助减少经典生物控制程序的成本,因为它们可以对多个站点进行快速采样,并且在很大程度上消除了解剖现场收集的宿主以确定是否存在寄生虫的耗时做法。

更新日期:2020-11-27
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