制造纳米凝胶,提高环虫腈对柑橘黄龙病病媒蚜虫的毒性和持久性。

Li Cui, Guiyun Deng, Jianghong Wu, Fang Ding, Wenjie Wang, Haiyang Yu, Zhiyong Song, Changhui Rui, Heyou Han, Huizhu Yuan
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摘要

导言:柑橘夜蛾是全球柑橘最严重的害虫,因为它是黄龙病的天然虫媒。啶虫脒(Cyc)对柑橘夜蛾有很强的毒性。但其溶解性和稳定性较差,限制了其发展:目的:为了提高 Cyc 的杀虫效果和在恶劣气候条件下的稳定性:方法:以 Cyc 为代表农药,用 4,4'-亚甲基双(苯基异氰酸酯)、PEG-600 和正丁醇制备缓释纳米凝胶颗粒(Cyc@NGs):结果:Cyc@NGs能将Cyc的毒性提高3倍以上。此外,Cyc@NGs 还具有优异的抗雨淋和抗紫外线能力。在紫外线照射 12 小时后,Cyc 的毒性下降了 100%,而 Cyc@NGs 的杀虫剂含量仅下降了 25%。此外,Cyc@NGs 在柑橘叶片上具有更好的润湿性,这主要得益于其在柑橘叶片上较低的接触角。此外,FITC 标记的纳米凝胶颗粒(FITC-NGs)在柑橘叶片组织和枸橘中肠中具有很强的渗透和富集能力。因此,NGs 促进了杀虫剂的转运和持久性,从而提高了杀虫活性。研究结果表明,纳米凝胶颗粒是一种很有前景的杀虫剂递送平台,Cyc@NGs 将成为有效防治柑橘褐飞虱的合适候选物质。
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Fabrication of nanogels to improve the toxicity and persistence of cycloxaprid against Diaphorina citri, the vector of citrus huanglongbing.

Introduction: Diaphorina citri is the most serious pest of citrus worldwide because it is the natural insect vector of huanglongbing. Cycloxaprid (Cyc) was highly toxic to D. citri. However, the poor solubility and stability had limited its development.

Objectives: In order to improve the insecticidal effect and stability to harsh climatic conditions of Cyc.

Methods: Cyc was chosen as the representative pesticide, 4,4'-methylenebis (phenyl isocyanate), PEG-600 and n-butanol were used to prepare sustained-release nano-gelation particles (Cyc@NGs).

Results: Cyc@NGs enhance the toxicity of Cyc more than 3 folds. Furthermore, Cyc@NGs showed excellent anti-rain and anti-UV capacity. After being exposed to ultraviolet light for 12 h, Cyc decreased by 100 %, while the insecticide content of Cyc@NGs only decreased by 25 %. Additionally, Cyc@NGs possessed better wettability on citrus leaves, mainly benefitting from its lower contact angle on citrus leaves. Moreover, FITC-labeled nano-gelation particles (FITC-NGs) exhibited high capability to penetrate and enrich in citrus leaf tissue and D. citri midgut. Consequently, NGs promoted the translocation and durability of insecticides, thereby, increasing the insecticidal activity. The results suggested that nano-gelation particle is a promising platform to deliver insecticides and Cyc@NGs would be the suitable candidate for the effective management of D. citri.

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