Tarbiat Modares University Journal of Agricultural Science and Technology 1680-7073 28 5 2026 09 01 Urea-Formaldehyde Nano-encapsulation Enhances Bunium persicum Essential Oil's Toxicity against Brevicoryne brassicae 1225 1239 27583 10.48311/jast.2026.27583 EN Masoud Heidary Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khorramabad, Islamic Republic of Iran. Shahriar Jafari Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khorramabad, Islamic Republic of Iran. Javad Karimzadeh Department of Plant Protection, Isfahan Research and Education Center for Agriculture and Natural Resources, AREEO, Isfahan, Islamic Republic of Iran. Maryam Negahban Department of Pesticide Research, Iranian Research Institute of Plant Protection, AREEO, Tehran, Islamic Republic of Iran. Jahanshir Shakarami Department of Plant Protection, Faculty of Agriculture, Lorestan University, Khorramabad, Islamic Republic of Iran. Mehran Rezaei Department of Plant Protection and Production, Institute of Agriculture, Iranian Research Organization for Science and Technology (IROST), Tehran, Islamic Republic of Iran. 0000-0002-5994-6939 Journal Article 2025 07 31 This study investigated the aphicidal activity of both pure and nanoencapsulated <em>Bunium</em> <em>persicum</em> (Boiss.) Fedtsch Essential Oils (EO) against <em>Brevicoryne brassicae L.</em>.<em> </em>The EO obtained through hydrodistillation and analyzed by Gas Chromatography and Mass Spectrophotometry (GC-MS), contained γ-terpinen (36.62%), ρ-cymene (18.41%), carvacrol (13.60%), and cuminaldehyde (13.50%) as its major components. Nanocapsules were synthesized via in situ polymerization of an oil-in-water emulsion and characterized by Dynamic Light Scattering (DLS) and Transmission Electron Microscopy (TEM), revealing spherical particles with a median diameter of 10.88 nm and a low Polydispersity Index (PDI) of 0.057. Bioassays demonstrated that the nanoencapsulated formulation exhibited significantly higher toxicity than the pure EO, with lower contact LC₅₀ and LC₉₀ values of 365.43 and 1908.46 µL L^-1 water, respectively, compared to the pure EO (1030.40 and 3977.08 µL L^-1 water). Similarly, the fumigant LC₅₀ and LC₉₀ values for the nanocapsules (23.15 and 59.49 µL L^-1 air) were significantly lower than those of the pure EO (35.07 and 79.59 µL L^-1 air). The findings suggest the potential of nanoencapsulated <em>B. persicum</em> EO in integrated pest management for controlling cabbage aphid. https://jast.modares.ac.ir/article_27583_8e767a1a905e130ad086869247c3f7f5.pdf