Bioactivity of Essential Oil from Citrus aurantium Peel against the Pulse Beetle Callosbruchus maculatus F. on Chickpea

Plant essential oils (EOs) and their active compounds are recognized as sustainable tools for the management of arthropod pests. The bitter orange, Citrus aurantium L. (Rutaceae), is a widespread tree in the Mediterranean region that is used especially as a rootstock for other Citrus. Although most of this plant's parts are accredited with medicinal properties, its fruits are not consumable and generally considered as non-valued waste. The aim of this work was to assess the potential use of the EO extracted by hydrodistillation from C. aurantium peel in the fumigation of chickpea seeds against Calloosbruchus maculatus. Analysis of EO of the bitter orange peel by gas chromatography coupled with a mass spectrometer (GC-MS) identified twenty-two compounds with limonene as the major component (86%). EOs of C. aurantium peel exerted toxic effects, in a concentration-dependent manner, on eggs (LC50 = 62.7 mu L/L air), larval stages inside the seed (LC50 = 62.8 mu L/L air), and adults (females: LC50 = 148 mu L/L air and males: LC50 = 109 mu L/L air). The C. aurantium EO also negatively affected the biological and demographic performances of the weevil compared to the untreated control. Fecundity and the number of emerged adults were reduced by more than 57 and 71, respectively, while the net reproduction rate and the intrinsic rate of increase were respectively decreased by over 71% and 37%, resulting in the total extinction of the pest at a concentration equal to 100 mu L/L air. Our findings suggest the possible valorization of bitter orange peel by using them as a source of bioinsecticide to be integrated within sustainable programs for the management of stored product pests. Further studies are needed to verify similar uses of essential oils extracted from solid wastes from citrus-processing industries.

Automated summary

This study aimed to evaluate the fumigation effect of essential oils (EOs) extracted from bitter orange peel on Calloosbruchus maculatus. The GC-MS analysis identified 22 compounds in the bitter orange peel EO, with limonene being the major component (86%). The EO showed toxic effects on eggs, larvae, and adults of the pest, indicating its potential as a sustainable bioinsecticide for the management of stored product pests.