Photoselective nets have proven to be effective for aphid pest control as they limit their dispersal ability. However, little is known on the impact of such nets on natural enemies of aphids. In this work, we study the effect of UV-absorbing nets on the syrphid fly Sphaerophoria rueppellii Wiedemann (Diptera: Syrphidae), a commercially available aphid biocontrol agent in Mediterranean horticultural crops. First, we released mature syrphid adults and evaluated density and dispersal of the resulting immatures in a turnip crop grown under either UV-blocking (Bionet) or standard net. Second, we assessed, under controlled conditions, the impact of UV radiation on fitness-related parameters, and on flight behavior of S. rueppellii adults. Results showed that, while syprhid immature density was higher, their dispersion was reduced under Bionet. UV-absorbing nets are known to influence the dispersion pattern of aphids, which may have indirectly conditioned the distribution of their predator S. rueppellii. On the other hand, the type of net had no influence on the performance of adults. We conclude that the use of photoselective nets and the release of syrphid predators such S. rueppellii are compatible strategies to be used in IPM aphid-control programs.

中文翻译：

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吸收紫外线的网对蚜虫捕食性无节食的性能的影响（双翅目：Syrphidae）

光选择性网被证明可有效控制蚜虫害虫，因为它们限制了其扩散能力。然而，人们对这种网对蚜虫天敌的影响知之甚少。在这项工作中，我们研究了紫外线吸收网对蓝鳞蝇Sphaerophoria rueppellii Wiedemann（Diptera：Syrphidae）（一种可在地中海园艺作物中使用的蚜虫生物防治剂）的影响。首先，我们释放了成熟的蓝鳍成年蝇，并评估了在紫外线阻断（Bionet）或标准网下种植的萝卜作物中未成熟幼虫的密度和扩散。其次，我们在受控条件下评估了紫外线辐射对健康相关参数的影响，以及对ru.pellepii的飞行行为的影响。大人。结果表明，虽然糖浆未成熟密度较高，但在Bionet下其分散度却降低了。已知吸收紫外线的网会影响蚜虫的分散模式，这可能间接限制了其捕食者Ru.pellepii的分布。另一方面，网的类型对成年人的表现没有影响。我们得出的结论是，使用光选择性网和释放syrphid捕食者如rueppellii是在IPM蚜虫控制程序中使用的兼容策略。