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Integrating management tactics to mitigate Spodoptera frugiperda resistance in Bt corn: refuge proportions, natural parasitoids, and selective insecticide application
Pest Management Science ( IF 3.8 ) Pub Date : 2024-12-12 , DOI: 10.1002/ps.8584
Maysa P Tomé, Igor D Weber, Adriano G Garcia, Wesley AC Godoy

BACKGROUNDDifferent approaches have been adopted to manage Spodoptera frugiperda resistance to Bt toxins. However, studying the synergism among these practices applied directly in crop fields is a major challenge. We used a computational model to investigate how the proportion of refuge strips [crop area occupied by non‐Bt corn (maize): 5%, 10%, 15%, or 20%] and the presence of naturally occurring parasitoid, affected or not by a pesticide with different selectivities applied in the field, could influence the dynamics of the resistance allele (R) in a S. frugiperda population.RESULTSOur model showed that proportions of 15% and 20% of non‐Bt corn, together with parasitism, led to a reduction in the initial frequency of the R allele. However, the efficiency of the parasitoid depended on the selectivity of the insecticide. Simulations with 5% non‐Bt corn and 50% selectivity, or without selectivity (0%), resulted in elimination of the parasitoid. In the absence of selection pressure, S. frugiperda larvae carrying at least one copy of the R allele showed higher susceptibility to parasitization.CONCLUSIONOur findings suggest that parasitoids can potentially reduce the need for refuge zones, because they offset the reduction of non‐Bt crops. Nevertheless, preservation of these benefical insects hinges upon the implementation of appropriate management practices by producers. Further investigations are warranted to corroborate these results, including the study of additional natural enemies. © 2024 Society of Chemical Industry.

中文翻译:


整合管理策略以减轻草地贪夜蛾对 Bt 玉米的抗药性:避难所比例、天然寄生虫和选择性杀虫剂施用



背景已采用不同的方法来管理草地贪夜蛾对 Bt 毒素的耐药性。然而,研究这些直接应用于农田的做法之间的协同作用是一项重大挑战。我们使用计算模型来研究避难条的比例 [非 Bt 玉米(玉米)占据的作物面积:5%、10%、15% 或 20%] 和天然存在的类寄生虫的存在,无论是否受到田间施用具有不同选择性的杀虫剂的影响,如何影响 S. frugiperda 种群中抗性等位基因 (R) 的动力学。结果我们的模型显示,15% 和 20% 的非 Bt 玉米的比例以及寄生性导致 R 等位基因的初始频率降低。然而,类寄生虫的效率取决于杀虫剂的选择性。用 5% 非 Bt 玉米和 50% 选择性或无选择性 (0%) 进行模拟,导致寄生虫的消除。在没有选择压力的情况下,携带至少一个 R 等位基因拷贝的 S. frugiperda 幼虫表现出更高的寄生敏感性。结论我们的研究结果表明,类寄生虫可能会减少对避难区的需求,因为它们抵消了非 Bt 作物的减少。然而,这些有益昆虫的保存取决于生产者实施适当的管理措施。需要进一步的调查来证实这些结果,包括对其他天敌的研究。© 2024 化工学会.
更新日期:2024-12-12
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