Silver nanoparticles (Ag NPs) was achieved by using leaf extract of Borago officinalis plant as eco-friendly reducing and capping agent. The results obtained from ultraviolet-visible spectrophotometer, dynamic light scattering, scanning & transmission electron microscopy, energy dispersive X-ray, and fourier transformed infrared confirmed the biosynthesis and the physical characterization of the produced nanoparticles. The synthesized Ag NPs was greatly more toxic to Spodoptera littoralis compared to crude extract. The LC50 values of the crude extract, and synthesized Ag NPs were 22.6 and 0.33 mg/g while LC90 values were 969.0 and 1.7 mg/g, respectively. Ag NPs and plant extract caused a significant elongation in larval period (18.02 and 18.82 days), respectively) compared with (15.78 days) in the control treatment. Whereas, there was no significant elongation in the pupal period in both males and females in case of Ag NPs and plant extract compared to the control treatment. Our results declared that the leaf crude extracts of B. officinalis and green synthesis of silver nanoparticles using it have the potential to be used as an ideal eco-friendly approach for controlling S. littoralis. This is the first report on the pesticide activity of this plant extract and its synthesized silver nanoparticles to control this insect pest.

中文翻译：

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使用 Borago officinslis 叶提取物生物合成银纳米颗粒，表征和杀幼虫活性对棉叶蠕虫，Spodoptera littoralis (Bosid)

银纳米粒子 (Ag NPs) 是通过使用紫草植物的叶提取物作为环保的还原剂和封端剂来实现的。从紫外-可见分光光度计、动态光散射、扫描和透射电子显微镜、能量色散 X 射线和傅立叶变换红外获得的结果证实了所产生纳米粒子的生物合成和物理特性。与粗提取物相比，合成的 Ag NPs 对 Spodoptera littoralis 的毒性更大。粗提物和合成银纳米颗粒的 LC50 值分别为 22.6 和 0.33 mg/g，而 LC90 值分别为 969.0 和 1.7 mg/g。与对照处理中的（15.78 天）相比，Ag NPs 和植物提取物导致幼虫期（分别为 18.02 和 18.82 天）的显着延长。然而，与对照处理相比，在 Ag NPs 和植物提取物的情况下，雄性和雌性的蛹期没有显着延长。我们的研究结果表明，厚朴的叶粗提取物和使用它绿色合成银纳米颗粒有可能用作控制滨海沙门氏菌的理想环保方法。这是关于这种植物提取物及其合成的银纳米粒子的杀虫活性的首次报告，以控制这种害虫。滨海。这是关于这种植物提取物及其合成的银纳米粒子的杀虫活性的首次报告，以控制这种害虫。滨海。这是关于这种植物提取物及其合成的银纳米粒子的杀虫活性的首次报告，以控制这种害虫。