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A study of landing behaviour by the walnut twig beetle, Pityophthorus juglandis , among host and nonhost hardwood trees in a northern California riparian forest
Agricultural and Forest Entomology ( IF 1.6 ) Pub Date : 2020-06-02 , DOI: 10.1111/afe.12385
Jackson P. Audley 1 , Crystal S. Homicz 2 , Richard M. Bostock 3 , Steven J. Seybold 4
Affiliation  

The host selection behaviour of the walnut twig beetle, Pityophthorus juglandis, was assessed by monitoring the landing rates of the beetles with sticky sheet traps on the host and nonhost hardwood branches. Sticky sheet traps were deployed for 8 weeks from 6 June to 2 August. 2017 in the Putah Creek Riparian Reserve, Davis, CA. Branches from host northern California black walnut, Juglans hindsii, were paired with branches from six nonhost hardwood species. The landing rate of P. juglandis (412 beetles trapped/8 weeks; 389 on host branches, 23 on nonhost branches) was significantly greater on the host branches for all nonhost hardwoods except Populus fremontii. Proportional comparisons of beetle presence also revealed a significant preference for the host branches compared with all but two nonhost species, Acer negundo and P. fremontii. Capturing P. juglandis without the use of an aggregation pheromone was a rare event, underscoring the difficulty of studying the initial phases of host selection behaviour in bark beetles. Unbaited funnel traps adjacent to selected host trees in the experiment only captured five individuals over a 19‐week period. None were captured in traps adjacent to nonhost trees. This study provided evidence that P. juglandis discriminates between host and nonhost branches while in‐flight. This directed flight behaviour is likely informed by the recognition of both host and nonhost volatile cues. This study established an ecological context for the development of a semiochemical‐based repellent system for protecting walnut trees from future attacks from this invasive bark beetle.

中文翻译:

核桃枝甲虫 Pityophthorus juglandis 对加利福尼亚北部河岸森林寄主和非寄主硬木树的着陆行为的研究

核桃枝甲虫 Pityophthorus juglandis 的寄主选择行为是通过监测甲虫在寄主和非寄主硬木树枝上带有粘性片状陷阱的着陆率来评估的。从 6 月 6 日到 8 月 2 日,粘纸陷阱部署了 8 周。2017 年,加利福尼亚州戴维斯普塔溪河岸保护区。寄主北加州黑胡桃的枝条与来自六种非寄主硬木树种的枝条配对。P. juglandis (412 只甲虫被困/8 周;寄主枝上 389 只,非寄主枝上 23 只) 在寄主枝上的登陆率对于除杨树外的所有非寄主硬木都显着更高。甲虫存在的比例比较也揭示了与除两种非寄主物种 Acer negundo 和 P. fremontii 之外的所有物种相比,对寄主分支的显着偏好。在不使用聚集信息素的情况下捕获 P. juglandis 是一个罕见的事件,这突显了研究树皮甲虫宿主选择行为初始阶段的困难。在实验中,与选定寄主树相邻的无诱饵漏斗陷阱在 19 周内仅捕获了 5 个个体。没有被捕获在与非寄主树相邻的陷阱中。这项研究提供了证据,证明胡桃在飞行中区分寄主和非寄主分支。这种定向飞行行为可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。强调研究树皮甲虫宿主选择行为的初始阶段的困难。在实验中,与选定寄主树相邻的无诱饵漏斗陷阱在 19 周内仅捕获了 5 个个体。没有被捕获在与非寄主树相邻的陷阱中。这项研究提供了证据,证明胡桃在飞行中区分寄主和非寄主分支。这种定向飞行行为可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。强调研究树皮甲虫宿主选择行为的初始阶段的困难。在实验中,与选定寄主树相邻的无诱饵漏斗陷阱在 19 周内仅捕获了 5 个个体。没有被捕获在与非寄主树相邻的陷阱中。这项研究提供了证据,证明胡桃在飞行中区分寄主和非寄主分支。这种定向飞行行为可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。在实验中,与选定寄主树相邻的无诱饵漏斗陷阱在 19 周内仅捕获了 5 个个体。没有被捕获在与非寄主树相邻的陷阱中。这项研究提供了证据,证明胡桃在飞行中区分寄主和非寄主分支。这种定向飞行行为可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。在实验中,与选定寄主树相邻的无诱饵漏斗陷阱在 19 周内仅捕获了 5 个个体。没有被捕获在与非寄主树相邻的陷阱中。这项研究提供了证据,证明胡桃在飞行中区分寄主和非寄主分支。这种定向飞行行为可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。这种定向飞行行为很可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。这种定向飞行行为可能是通过对宿主和非宿主易失性线索的识别来告知的。该研究为开发基于信息素化学的驱虫系统建立了生态环境,以保护核桃树免受这种入侵树皮甲虫的未来攻击。
更新日期:2020-06-02
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