Hylobius warreni Wood (Coleoptera: Curculionidae) is a pest of conifers, especially lodgepole pine (Pinus contorta var. latifolia Douglas ex Loudon) (Pinales: Pinaceae) in the Interior of British Columbia. The larvae feed on the roots and root collars and cause girdling damage, resulting in mortality or growth reductions. Previous research has suggested the adult weevils locate potential host trees by using random movements and vision, but likely not chemosensory cues. The purpose of this study is to determine if adult H. warreni respond to particular tree characteristics versus encounter potential hosts at random. Study A was a capture–mark–recapture experiment where weevils were captured on mature pine trees, while Study B was a tracking experiment within a young pine plantation. Weevils showed a preference for larger trees, and for trees that were closer to the weevil’s last known location. In Study A, weevils also avoided climbing trees in poor health, while in Study B, the weevils’ preference for taller trees increased as their distance from the weevil increased, as well as when taller trees were closer to other trees. Movement rates were similar to those observed in previous studies, were positively correlated with the average spacing of trees, and declined with time after release. This confirms previous findings that H. warreni may locate host trees by both vision and random movements, and that their movements are determined primarily by the size and distribution of potential host trees within their habitat.

中文翻译：

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Warren根领象鼻虫（鞘翅目：Curculionidae）的随机和定向运动，相对于寄主Lodgepolepole松树的大小和距离。

Hylobius warreni伍德（鞘翅目：象甲科）是针叶树的害虫，特别是黑松（松扭叶松变种叶冬青道格拉斯前劳登）（松柏：松科）在不列颠哥伦比亚省的内部。幼虫以根和根领为食，并造成环剥损伤，从而导致死亡率或生长减少。先前的研究表明，成年象鼻虫通过随机运动和视觉定位潜在的寄主树，但可能不是化学感应线索。这项研究的目的是确定成年H. warreni对特定的树特征做出响应，而不是随机遇到潜在的宿主。研究A是捕获标记再捕获实验，其中在成熟的松树上捕获了象鼻虫，而研究B是在年轻的松树人工林中进行的跟踪实验。象鼻虫偏爱较大的树木和较接近象鼻虫的已知树木的树木。在研究A中，象鼻虫还避免在身体不好的情况下爬树，而在研究B中，随着它们与象鼻虫的距离增加，以及当较高的树离其他树木更近时，象鼻虫对高大的树木的偏好也增加了。移动速度与先前研究中观察到的移动速度相似，与树木的平均间距呈正相关，并且在释放后随时间下降。这证实了先前的发现，即H. warreni 可能通过视觉和随机运动来定位寄主树，并且它们的运动主要取决于其栖息地内潜在寄主树的大小和分布。