Development of essential oil-based pesticide formulations: Challenges and advances

The increasing reliance on synthetic pesticides in agriculture has led to significant environmental and health concerns, necessitating the development of safer, more sustainable alternatives. Essential oils (EOs), derived from plants, have gained attention due to their natural insecticidal, repellent, and fungicidal properties. However, their direct application in pest management is hindered by challenges such as high volatility, limited residual activity, and poor water solubility. This study investigates the development of essential oil-based pesticide formulations using Nanoemulsion and polymeric nanoparticle encapsulation technologies to address these limitations. Eucalyptus oil, neem oil, and citronella oil were selected for their proven pesticidal activity. Nanoemulsion formulations were prepared using high-energy homogenization, while polymeric nanoparticles were prepared through a solvent evaporation method. The efficacy of the formulations was assessed against key agricultural pests, including Spodoptera litura, Aphis gossypii, and Bemisia tabaci. Results demonstrated that eucalyptus oil-based Nanoemulsions exhibited the highest mortality rates, reaching up to 72% for Spodoptera litura after 72 hours of exposure. Additionally, the stability of the Nanoemulsion formulations was evaluated over a 30-day period, showing minimal changes in particle size and sustained insecticidal activity. The encapsulation of essential oils not only enhanced their efficacy but also improved their stability, reducing volatility and increasing their field longevity. These findings suggest that essential oil-based Nanoemulsion formulations represent a promising alternative to synthetic pesticides, offering an eco-friendly, effective solution for sustainable pest management. Further studies on environmental impacts and large-scale applications are needed to fully integrate these formulations into agricultural practices.