Induced allopatry as main mechanism explaining trap catch reduction in low dose mating disruption trials on the strawberry pest Acleris comariana (Lepidoptera: Tortricidae),Pest Management Science

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Induced allopatry as main mechanism explaining trap catch reduction in low dose mating disruption trials on the strawberry pest Acleris comariana (Lepidoptera: Tortricidae)
Pest Management Science ( IF 3.8 ) Pub Date : 2025-05-27 , DOI: 10.1002/ps.8877
Glenn Peter Svensson ₁ , Victoria Tönnberg ₂ , Linda-Marie Rännbäck ₂ , Fredrik Andersson ₃ , Erik Hedenström ₃ , Lene Sigsgaard _{4,

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Affiliation

BACKGROUNDThe strawberry tortrix, Acleris comariana (Lepidoptera: Tortricidae), is a destructive pest of strawberry in Denmark and southern Sweden. The efficacy of pheromone‐based communication disruption of the species was examined in crop fields in southern Sweden. Due to the high cost of purchasing or synthesizing the pheromone (E)‐11,13‐tetradecadienal, lower quantities were applied per ha compared to similar mating disruption studies on other tortricid pests.RESULTSWhen treating 1 ha within fields with 14 or 1.4 g of pheromone and using rubber septa as dispensers, trap catches were reduced by ≥98% versus control areas. When treating whole fields with 0.45–0.90 g/ha and using 1 g SPLAT droplets as dispensers, the effect on trap catch was less pronounced (63–95% reduction vs control fields). A corresponding reduction in larval numbers following the treatment was not achieved. Additional experiments revealed that males are more attracted to SPLAT droplets compared to trap lures, and aggregate near SPLAT droplets, indicating that low catches in traps were due to induced allopatry, a form of competitive disruption. In addition, female‐baited traps were outcompeted when placed close to septum‐baited traps. Pest densities were high, and the lack of control effect could be attributed to high encounter rates between the sexes despite the female competitive disadvantage, making mating disruption less efficient.CONCLUSIONOur data show the potential for pheromone‐based control of A. comariana as part of integrated pest management, but the method needs optimization regarding density and strength of dispensers and ways to reduce the initial density of the pest to levels where competitive mechanisms of mating disruption can be efficient. © 2025 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.

中文翻译：

诱导异体是解释草莓害虫 Acleris comariana（鳞翅目：Tortricidae）低剂量交配干扰试验中诱捕捕获减少的主要机制

背景草莓卷曲 Acleris comariana（鳞翅目：Tortricidae）是丹麦和瑞典南部的一种草莓破坏性害虫。在瑞典南部的农田中检查了基于信息素的物种通讯破坏的功效。由于购买或合成信息素（E）-11,13-十四癸二烯醛的成本很高，因此与对其他 tortricid 害虫的类似交配干扰研究相比，每公顷施用的数量较低。结果当用 14 或 1.4 g 信息素处理田地内的 1 公顷土地并使用橡胶隔垫作为分配器时，与对照区域相比，诱捕捕获量减少了 ≥98%。当以 0.45-0.90 克/公顷的浓度处理整块田地并使用 1 克 SPLAT 液滴作为分配器时，对诱捕器捕获的影响不太明显（与对照田相比减少了 63-95%）。处理后幼虫数量没有达到相应的减少。其他实验表明，与诱捕诱饵相比，雄性更容易被 SPLAT 液滴吸引，并在 SPLAT 液滴附近聚集，这表明诱捕器中的低渔获量是由于诱导的异体作用，这是一种竞争性破坏形式。此外，当放置在隔膜诱饵陷阱附近时，雌性诱饵陷阱在竞争中处于劣势。害虫密度高，缺乏控制效果可归因于尽管雌性竞争劣势，但两性之间的相遇率很高，这使得交配干扰效率较低。结论我们的数据显示，作为综合害虫管理的一部分，基于信息素的 A. comariana 控制具有潜力，但该方法需要优化分配器的密度和强度，以及将害虫的初始密度降低到竞争配干扰机制可以有效的水平的方法。© 2025 作者。由 John Wiley & Sons Ltd 代表化学工业协会出版的《害虫管理科学》。

更新日期：2025-05-27

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