Insecticidal application of essential oils loaded polymeric nanoparticles to control German cockroach: Design,...

Area of Science:

• Entomology
• Materials Science
• Nanotechnology

Background:

• The German cockroach (Blatella germanica) is a significant pest, necessitating novel control strategies.
• Essential oils (EO) show insecticidal properties but require formulation for enhanced efficacy and stability.

Purpose of the Study:

• To develop and evaluate essential oil-loaded polymeric nanoparticles (EOPN) as a nanoinsecticide against the German cockroach.
• To assess the physicochemical properties and insecticidal activity of peppermint and palmarosa EOPN.

Main Methods:

• Essential oils from five plant species were screened for activity against Blatella germanica.
• The most effective oils (peppermint and palmarosa) were formulated into nanoparticles using a polyethylene glycol 6000 matrix.
• Physicochemical properties including size, loading efficiency (LE), and polydispersity index (PDI) of EOPN were analyzed.
• Lethal and sublethal effects of EOPN on German cockroaches were evaluated.

Main Results:

• Peppermint and palmarosa essential oils demonstrated the highest efficacy against German cockroaches.
• Peppermint EOPN exhibited a size of 380 nm, 72.25% LE, and a polydisperse PDI (>0.4).
• Palmarosa EOPN measured 191 nm, with 89.75% LE and a monodisperse PDI (<0.25).
• Both peppermint and palmarosa EOPN significantly enhanced the insecticidal activity against Blatella germanica.

Conclusions:

• The developed essential oil polymeric nanoparticles (EOPN) represent a promising nanoinsecticide formulation.
• Peppermint and palmarosa EOPN show potential for effective control of German cockroach populations.
• Nanoparticle formulation enhances the delivery and efficacy of essential oils for pest management.