Van de Vijver Elias, Landschoot Sofie, Van Roie Martijn, Temmerman Femke, Dillen Jill, De Ceuleners Kevin, Smagghe Guy, De Baets Bernard, Haesaert Geert
Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.
Department of Biology - Ecosystem management research group, University of Antwerp, Universiteitsplein, Wilrijk, Belgium.
Environ Entomol. 2019 Apr 3;48(2):276-283. doi: 10.1093/ee/nvz002.
Cereal leaf beetles (CLBs), a group of chrysomelid beetles of the genus Oulema (Coleoptera: Chrysomelidae), are well-known pest insects of small-grain cereals in many countries of the Northern hemisphere. Due to the small differences in morphology of species within this genus, classification up to species level remains a challenging task. Since an accurate view of species composition is important for developing targeted control strategies, the goal of this study was to unravel the Oulema species composition in Flanders' wheat fields. During three subsequent years at a series of different fields, Oulema species were collected and classified up to species level (2016: 28 fields, 2017: 30 fields, and 2018: 23 fields). This study reveals that the population consists of four different species: Oulema melanopus, Oulema duftschmidi, and Oulema obscura were most frequently encountered, while Oulema rufocyanea was only marginally present. Furthermore, the population was highly dynamic, as the population share of each species varied between different growing seasons and between the various sampling events within each season. The distance from the field edge had a minor influence on the species composition, but the abundance of beetles increased with the distance to the field edge. A discriminant analysis revealed that based on the measurements of various body parts, an accurate classification up to species level is possible. In conclusion, we observed that the population densities fluctuated within and between years, resulting in variable incidence of CLB in winter wheat fields in the Flanders region.
谷物叶甲（CLBs）是奥勒玛属（鞘翅目：叶甲科）的一群叶甲科甲虫，是北半球许多国家小粒谷物中广为人知的害虫。由于该属物种在形态上差异较小，在种级水平上进行分类仍然是一项具有挑战性的任务。由于准确了解物种组成对于制定有针对性的控制策略很重要，本研究的目的是弄清楚佛兰德小麦田中的奥勒玛物种组成。在随后的三年里，在一系列不同的田块中收集了奥勒玛物种并在种级水平上进行分类（2016年：28块田，2017年：30块田，2018年：23块田）。这项研究表明，该种群由四种不同的物种组成：最常遇到的是黑奥勒玛、杜氏奥勒玛和暗奥勒玛，而红褐奥勒玛仅少量存在。此外，该种群具有高度动态性，因为每个物种的种群比例在不同生长季节以及每个季节内的不同采样事件之间有所变化。离田边的距离对物种组成影响较小，但甲虫的数量随着离田边距离的增加而增加。判别分析表明，基于对各种身体部位的测量，可以在种级水平上进行准确分类。总之，我们观察到种群密度在年内和年间波动，导致佛兰德地区冬小麦田谷物叶甲的发生率各不相同。
