Spotted wing drosophila, Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), is an invasive pest which causes important damage to fruit crops, in particular in strawberry and cherry fields in Europe and North America. So far, its interaction with local fauna remains poorly studied, whereas it could give insight in the possibilities of biological control by using local predators. Indeed, no sustainable means of controlling populations of this fruit fly have been found, and alternative methods of pest management are needed. Here we compared the efficiency of 16 selected macroarthropods present in strawberry and cherry fields and farm structures from northern France. Most of them have never been tested against D. suzukii for their ability to disrupt its egg-laying behavior and/or to prey upon it under experimental conditions. A set of 17 morphological and behavioral traits potentially associated with the predation success of macroarthropods was measured. We counted nearly 16 000 eggs laid by female D. suzukii on artificial substrate in 1 008 experimental arenas. We observed an egg difference ranging from +65 to –98% in the presence of an arthropod, compared to control arenas (without arthropods), with an overall mean decrease of 44%. Some macroarthropod predatory species, mostly spiders (from the families Agelenidae, Salticidae, and Lycosidae) and the centipede Lithobius forficatus (L.), were efficient at killing the flies before they could lay eggs. Other species, such as the carabids Limodromus assimilis (Pontoppidan) and Poecilus cupreus (L.), or the woodlouse Porcellio scaber (Latreille), reduced egg-laying despite a lower predation rate. The macroarthopods’ traits mainly involved in predation and disruption of oviposition were the size of their body and their mobility. Our results add novel information about the acceptability of D. suzukii as prey for common macroarthropods of the local fauna. This experimental approach provides a first pre-selection of promising macroarthropods that could be interesting in the control of D. suzukii populations.

中文翻译：

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大型节肢动物对铃木果蝇产卵过程的影响：实验性筛选

斑翅果蝇Drosophila suzukii（Matsumura）（Diptera：Drosophilidae）是一种侵害性害虫，会对水果作物造成重要损害，特别是在欧洲和北美的草莓和樱桃田。迄今为止，它与当地动物的相互作用尚缺乏研究，而通过使用本地捕食者，它可以提供有关生物控制可能性的见识。的确，没有发现控制这种果蝇种群的可持续手段，需要替代的有害生物管理方法。在这里，我们比较了法国北部草莓和樱桃田以及农场结构中存在的16种精选节肢动物的效率。他们中的大多数从未针对铃木D.进行过测试在实验条件下具有破坏其产卵行为和/或捕食它的能力。测量了一组可能与大型节肢动物的捕食成功相关的17个形态和行为特征。我们在1 008个实验场所中计数了近16000个由雌性铃木D.产在人工基质上的卵。我们观察到，与节肢动物（无节肢动物）相比，节肢动物存在时，卵的差异介于+65至–98％之间，总体平均下降幅度为44％。一些大型节肢动物的掠食性物种，主要是蜘蛛（来自Age科（Agelenidae，Salticidae和Lycosidae）和LiLithobius forficatus（L。））在杀死卵之前可以有效杀死苍蝇。其他种类，例如钩甲尽管捕食率较低，但Limodromus assimilis（Pontoppidan）和Poecilus cupreus（L.）或木虱Porcellio scaber（Latreille）的产卵量减少。大型节肢动物的特征主要在于掠食和破坏产卵，它们的大小和活动能力。我们的研究结果增加了有关铃木D.作为当地动物常见的节肢动物食肉动物的猎物的可接受性的新信息。这种实验方法提供了有前途的大型节肢动物的第一次预选，这可能在控制铃木种群方面很有趣。