Sawtoothed grain beetles, Oryzaephilus surinamensis (Coleoptera: Silvanidae), cause severe damage to various stored products, reducing their quality and nutritional value. Several chemical pesticides have been introduced to control this pest and mitigate damage, but these pesticides also affect human health and the environment, enticing researchers to seek safer products and technology, such as plant-based products and nanotechnology. In this study, we compared the effectiveness of citronella essential oil and its nanoemulsion in controlling O. surinamensis adults. The citronella essential oil was obtained through hydrodistillation, and analyzed using gas chromatography (GC) and GC/mass spectrometry (MS based on the GC-MS analysis, the predominant compounds were citronellal (46.95%), citronellol (9.49%), linalool (9.46%), β-caryophyllene (8.39%). The particles size of the prepared nanoemulsion was 57.98 nm. The lethal concentration that causes 50% mortality (LC₅₀) in O. surinamensis adults for the pure essential oil and its nanoemulsion was 10, 15, 20, and 25 µL/L. The nanoemulsion was more effective against both females (LC₅₀ = 20.3 µL/L) and males (LC₅₀ = 15.7 µL/L) than the pure essential oil (LC₅₀ = 40.02 and 52.5 µL/L, respectively). There was a significant difference in toxicity between the pure essential oil and its nanoemulsion. In addition, there were statistically significant differences (P < 0.05) between males and females when using citronella nanoemulsion only. In conclusion, citronella nanoemulsion is effective in controlling O. surinamensis and represents a promising alternative to chemical pesticides for protecting stored products.

锯齿状谷物甲虫，Oryzaephilus surinamensis（鞘翅目：Silvanidae）对各种储存产品造成严重损害，降低其质量和营养价值。已经引入了几种化学杀虫剂来控制这种害虫并减轻损害，但这些杀虫剂也会影响人类健康和环境，促使研究人员寻求更安全的产品和技术，例如植物产品和纳米技术。在这项研究中，我们比较了香茅精油及其纳米乳在防治O. surinamensis中的有效性成年人。香茅精油通过加氢蒸馏获得，采用气相色谱（GC）和气相色谱/质谱（MS基于GC-MS分析，主要成分为香茅醛（46.95%）、香茅醇（9.49%）、芳樟醇（ 9.46%), β-石竹烯 (8.39%)。制备的纳米乳粒径为 57.98 nm。纯精油及其纳米乳对苏里南稻成虫造成50% 死亡率 (LC ₅₀ )的致死浓度为 10 , 15, 20, 和 25 µL/L。纳米乳液对女性 (LC ₅₀ = 20.3 µL/L) 和男性 (LC ₅₀ = 15.7 µL/L) 均比纯精油 (LC _{50 ) 更有效}= 40.02 和 52.5 µL/L）。纯精油与其纳米乳液的毒性存在显着差异。此外，仅使用香茅纳米乳时，男性和女性之间的差异有统计学意义（P < 0.05）。总之，香茅纳米乳在控制O. surinamensis方面是有效的，并且代表了用于保护储存产品的化学农药的有希望的替代品。