Effect of the flavonoid rutin on the biology of Spodoptera frugiperda (Lepidoptera: Noctuidae)

ABSTRACT The fall armyworm Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is a major pest of maize crops in Brazil. The effects of plant metabolites on the biology and behavior of insects is little studied. The aim of the study was to evaluate the activity of rutin on the biology of the S. frugiperda by using artificial diets containing rutin. The study evaluated four treatments: regular diet (control group) and diets containing 1.0, 2.0 and 3.0 mg g-1 of rutin. The following biological variables parameters of the larvae were evaluated daily: development time (days), larval and pupal weight (g) and viability (%), adult longevity and total life cycle (days). A completely randomized experimental design was used with 25 replication. The rutin flavonoid negatively affected the biology of S. frugiperda by prolonging the larval development time, reducing the weight of larvae and pupae and decreasing the viability of the pupae. The addition of different concentrations of rutin prolonged the S. frugiperda life cycle. The use of plant with insecticidal activity has the potential with strategy in IPM.

摘要 草地贪夜蛾（Spodoptera frugiperda，J.E. Smith）（鳞翅目：夜蛾科）是巴西玉米作物的主要害虫。目前针对植物代谢物对昆虫生物学特性与行为的影响的研究仍较为匮乏。本研究旨在通过添加芦丁的人工饲料，评估芦丁对草地贪夜蛾生物学特性的调控效应。实验设置4个处理组：常规人工饲料（对照组），以及分别添加1.0、2.0、3.0 mg·g⁻¹芦丁的人工饲料。每日对幼虫的以下生物学参数进行观测：发育历期（天）、幼虫与蛹重（g）、存活率（%）、成虫寿命及总生活周期（天）。本实验采用完全随机设计，设置25次生物学重复。结果表明，芦丁类黄酮可对草地贪夜蛾的生物学特性产生负面影响：延长幼虫发育历期、降低幼虫与蛹的体重，并降低蛹的存活率。添加不同浓度的芦丁均可延长草地贪夜蛾的完整生活周期。将具备杀虫活性的植物源物质应用于害虫综合防治（Integrated Pest Management，IPM）策略，具有潜在的应用价值。