Native to Southeast Asia, the spotted wing drosophila (SWD), Drosophila suzukii Matsumura, rapidly invaded America and Europe in the past 20 years. As a crop pest of soft-skinned fruits with a wide range of host plants, it threatens the fruit industry worldwide, causing enormous economic losses. To control this invasive pest species, an understanding of its population dynamics and structure is necessary. Here, we report the population genetics and development of SWD in Germany from 2017–19 using microsatellite markers over 11 different sample sites. It is the first study that examines SWD’s genetic changes over 3 years compared to multiple international SWD laboratory strains. Results show that SWD populations in Germany are highly homogenous without differences between populations or years, which indicates that populations are well adapted, migrate freely, and multiple invasions from outside Germany either did not take place or are negligible. Such high genetic variability and migration between populations could allow for a fast establishment of the pest species. This is especially problematic with regard to the ongoing spread of this invasive species and could bear a potential for developing pesticide resistance, which could increase the impact of the SWD further in the future.

斑翅果蝇（SWD）原产于东南亚，铃木果蝇（Drosophila suzukii）松村在过去的20年中迅速入侵了美国和欧洲。作为带有多种寄主植物的软皮水果的农作物害虫，它威胁着全世界的水果产业，造成了巨大的经济损失。为了控制这种侵入性有害生物物种，有必要了解其种群动态和结构。在这里，我们报告了使用11个不同样本站点上的微卫星标记在2017-19年期间德国的社署人口遗传学和发展情况。这是第一项研究与3种国际SWD实验室菌株相比3年以来SWD的遗传变化的研究。结果表明，德国的SWD种群具有高度的同质性，种群之间或年份之间没有差异，这表明这些种群适应性强，迁移自如，而且没有发生来自德国以外的多次入侵，或者可以忽略不计。如此高的遗传变异性和种群之间的迁移可能使害虫物种快速建立。就这种入侵物种的持续传播而言，这尤其成问题，并且可能具有发展农药抗药性的潜力，这可能会在未来进一步增加社署的影响。