Abstract

Bemisia tabaci is an agricultural pest of worldwide distribution that causes serious damage to several crops. It is of crucial importance to control this pest, especially for large-scale production. Accordingly, formulations based on essential oils of pesticidal action are potentially promising in the agricultural sector. Additionally, the nanoencapsulation of these bioactive compounds promotes their protection from environmental degradation and prolongs their biological activity. Here, we develop PCL (poly-ε-caprolactone) nanoparticles containing essential oils of Xylopia aromatica leaves and fruits and evaluate their insecticidal effect in B. tabaci Middle East Asia Minor 1 biotype B. The average yields of essential oils from leaves and fruits of X. aromatica were 0.05 and 0.80%, respectively. The major compounds in the essential oil of leaves were bicyclogermacrene (44.80%), α-pinene (8.23%) and β-pinene (7.75%) while in fruits were α-pinene (35.40%), β-phellandrene (31.05%) and β-pinene (22.51%). The PCL nanoparticles containing the essential oils exhibited encapsulation efficiency of 95% and particle diameter smaller than 500 nm. Biodegradable nanospheres substantially protected the essential oils from accelerated degradation caused by UV light and also prevented possible phytotoxic activity of the in natura essential oil from leaves of X. aromatica in high concentrations, probably due to the gradual release. In natura and nanoencapsulated essential oils from leaves and fruits decreased (up to 98%) the oviposition of B. tabaci in common bean leaves. Our results indicate that both in natura and nanoencapsulated oils of X. aromatica may potentially be used as alternative to the chemical control of B. tabaci.

Graphic abstract

中文翻译：

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在自然和纳米封装的香薰木香精油中，可减少菜豆中烟粉虱的产卵。

摘要

烟粉虱是一种全球分布的农业害虫，对几种农作物造成了严重破坏。控制这种有害生物至关重要，特别是对于大规模生产而言。因此，基于农药作用的香精油的制剂在农业领域中是有希望的。另外，这些生物活性化合物的纳米囊封促进了其对环境降解的保护并延长了其生物活性。在这里，我们开发了含有木香香叶和果实精油的PCL（聚-ε-己内酯）纳米颗粒，并评估了它们对烟粉虱中东亚小生物B型的杀虫效果。芳香木霉分别为0.05和0.80％。叶片精油中的主要化合物为双环锗烷（44.80％），α-pine烯（8.23％）和β-pine烯（7.75％），而果实中的主要成分为α-pine烯（35.40％），β-ph烯（31.05％）。和β-pine烯（22.51％）。含有精油的PCL纳米颗粒的包封效率为95％，粒径小于500 nm。可生物降解的纳米球从本质上保护了精油免于紫外线引起的加速降解，并且还防止了高浓度芳香木aromatic叶片的天然精油中可能的植物毒性活性，这可能是由于逐渐释放所致。在自然和纳米封装的叶子和果实中的精油减少（高达98％）的产卵量。普通豆中的烟粉虱。我们的研究结果表明，无论是在NATURA和纳米胶囊化油X.郁金可潜在地用作替代的化学控制烟粉虱。

图形摘要