Effect of Citrus limonum essential oil against granary weevil, Sitophilus granarius and its chemical composition, biological activities and energy reserves

Toxicity and repellent activities of Thymus pallescens and Cymbopogon citratus essential oils against Sitophylus granarius

“…This decrease in protein content could be attributed to one or more factors, such as a decrease in protein synthesis or an increase in protein degradation, and the detoxification of the molecules affected by the bioactive principles present in the EOs (Vijayaraghavan et al 2010;Ranjini et al 2016). Similar results were obtained using C. limonum EO on the hemolymph protein of S. granarius (Guettal et al 2021). In our study, the carbohydrate contents of the tested pest insect were significantly decreased after EO treatments.…”

“…Insects typically convert carbohydrates into lipids and glycogens (Sönmez & Gülel 2008), which could explain https://doi.org/10.17221/185/2020-PPS the observed reduction in carbohydrate levels and the increased lipid levels observed in the treated insects. Similar results were obtained in S. granarius treated with C. limonum EO (Guettal et al 2021) and in T. castaneum and Callosobruchus maculatus (Fabricius, 1775) treated with cardamom, cinnamon, and nutmeg EOs (Tarigan & Harahap 2016). The increase in lipid levels can be explained by the establishment of the tegument in insects to prevent the harmful effects of EOs.…”

“…In addition, both repellent and toxic activities increased with increasing concentrations, and the highest repellant and toxic effects were recorded with T. pallescens EO against S. granarius. Toxic and repellant activities have previously been described for other EOs derived from various plants against S. granarius and other stored insect pests (Kordali et al 2005;Kim et al 2010;Kordali et al 2012;Ziaee et al 2014;Plata-Rueda et al 2018;Gong & Ren 2020;Plata-Rueda et al 2020;Teke & Mutlu 2020;Guettal et al 2021). The toxicity and repellency of both EOs and the differences observed in their efficiencies might be attributed to their different bioactive compounds and their variability, depending on the origin plant species.…”

“…52% for Citrus limonum EO against S. granarius(Guettal et al 2021). Another study ofPlata-Rueda et al (2018) reported that cinnamon and clove EOs possessed significant toxic and repellent activities against S. granarius.…”

“…EOs extracted from aromatic plants can represent potential sources of alternative bioactive compounds that can be used to manage stored grain insect pests. Several plant species, belonging to various families, have been reported as being capable of managing insect pest species that affect stored products, particularly S. granarius (Campolo et al 2018;Trivedi et al 2018;Yang et al 2020;Guettal et al 2021). However, few experimental studies have been designed to examine the effects of EOs and their modes of action against S. granarius.…”