Biocidal activity of Ziziphora hispanica L and Satureja calamintha Scheele L essential oils against the Callosobruchus maculatus (Fabricius) pest on cowpea seeds during storage

Introduction

Seed legumes occupy a considerable place in the world diet, particularly in developing countries, where they have a primary role among many populations in Africa, South America, and Asia (Singh and Singh, 1992). They are the most important source of protein for humans and are considered the second most important food source after cereals (Kouris-Blazos and Belski, 2016). Their incorporation in the diet, particularly in developing countries, can be a major contributor to combating malnutrition (Maphosa and Jideani, 2017). In addition to their nutritional value, legumes also have economic, cultural, physiological, and medicinal roles due to their presence of bioactive products beneficial to humans (Phillips, 1993; Bouchenak and Lamri-Senhadji, 2013; Remond and Walrand, 2017). Food legumes, such as soybeans, beans, cowpeas, broad beans, chickpeas, lentils, and peanuts, are consumed as protein-rich dry seeds. Humans cultivate them because of their key role in diversifying diets and ensuring global food security (Singh et al., 2022).

Cowpea (Vigna unguiculate L.), as known as black pea, is one of the most nutrient-rich native African legumes and is a great interest for food quality and nutritional health (Abebe and Alemayehu, 2022). Cowpea grains are rich in protein, carbohydrates, and fiber, while their leaves and pods contain numerous vitamins and minerals (Avanza et al., 2013).

Cowpea is known in Morocco; it is grown in small areas in the southern Atlas oases, and seeds are available in the souks and markets of the major cities, particularly in Fez (Bryssine, 1962). Currently, in Morocco, this legume is planted in the northwestern regions, especially in Fez, and is locally named Gnawas beans. Nowadays, the cultivation of cowpeas, as well as their preparation and consumption, has spread to other regions of Morocco. Although Moroccans widely consume cowpea, studies on this type of legume are still limited. In Morocco, insect pests cause significant damage to stored legumes. Despite the magnitude of losses caused by insect pests, only a limited number of studies have shed light on these pests in Africa.

Among legume beetles, the cowpea beetle, Callosobruchus maculatus (Fabricius), is the main culprit that causes severe damage to most legumes, especially cowpeas. This beetle is a member of the family Chrysomelidae and the subfamily Bruchinae (Kergoat et al., 2008). However, many stored legumes are affected by this beetle, which is commonly recognized as cowpea weevil or bean beetle (Onyido et al., 2011).

C. maculatus causes significant damage in seed storage areas, where females lay eggs on the seed coat following hatching. Larvae penetrate the seeds, develop by depleting the reserves of cotyledons, transform into pupae, and complete their life cycle by emerging as adult beetles, resulting in significant quantitative and qualitative losses and leading to damages that can reach 100% after a few months (Seri-Kouassi et al., 2004). Nevertheless, very few studies have been carried out in Morocco to quantify and evaluate the impact of this problem, although patchy results are available.

Due to the serious damage caused by C. maculatus to cowpea seeds, various approaches have been adopted to effectively control this pest (Kébé et al., 2020). Due to the serious damage caused by C. maculatus to cowpea seeds, various approaches have been adopted to effectively control this pest (Kébé et al., 2020). Several phytosanitary chemicals have been used to manage this pest during the seed storage period. However, the success of synthetic pesticides is hampered by several factors, including the high cost of their acquisition, the risks of environmental contamination, the toxicity of residues accumulated in food, pest resistance problems, the destruction of natural predators, and harmful effects on non-target organisms (Mohan et al., 2010; Ileke et al., 2020).

The valorization of plant products is an alternative approach to organic pesticides. These methods make it possible to extract active substances from various plant species offering different properties using appropriate devices, so that these bioproducts can be used to combat pests in stored foodstuffs (Aker et al., 2023).

The essential oils (EOs) derived from different plant species characterized by a pronounced odor and represent an attractive alternative to chemical products (Sarma et al., 2019). These natural products extracted from plants contain various bioactive compounds (Nisar et al., 2022). The EOs exert ovicidal and larvicidal effects on insects, impede their respiratory capacity, eliminate their oviposition mode, serve as both a repellent and attractant, decrease the emergence of adult insects, and prevent the recognition of the target plant (Rastegar et al., 2011). This research considers that Morocco has no data yet on the damage caused by the insect C. maculatus on cowpea.

There are several plant families that produce essential oils: Burseraceae, Compositae, Cupressaceae, Lamiaceae, Lauraceae, Myrtaceae, Piperaceae, Apiaceae, Asteraceae, Poaceae, Rutaceae, and Zingiberaceae (Chaubey, 2019; Matos et al., 2020; Teke and Mutlu, 2021; De Andrade Rodrigues et al., 2022). In this perspective, many species belonging to the Lamiaceae family have proved very effective for controlling various insect pests on stored foodstuffs (Mishra et al., 2012; Alkan, 2020).

This research has been carried out to examine the effectiveness of two EOs extracted from two plants of the Lamiaceae family and to determine their insecticidal fumigant and repellent effectiveness. Z. hispanica, as known by the by the Pennyroyal Mint of dry areas (Bellakhdar, 1997; Boullard, 2001), or named in Arabic Fliou, fliyou berri (Fennane and Rejdali, 2016; Najem et al., 2021), is a fragrant and highly aromatic plant. It’s odor is intense, pleasant, fresh, and penetrating, approaching those of the Pennyroyal Mint (Mentha pulegium). And S. calamintha or Sarriette, calament calamint (Lahsissene et al., 2009; Tibaldi et al., 2013) its Arabic name is manta, Nebta (Lahsissene et al., 2009), this plant has a scent of mint. These species are native to Europe and the Mediterranean Basin (Bellakhdar, 1997), and North Africa (Algeria, Morocco) (Boudjema et al., 2018; Redhouane et al., 2020). In Morocco, Z. hispanica and S. calamintha species grow spontaneously in the High Atlas, Middle Atlas, Eastern Plateaus, Eastern Mountains, and Rif regions (Fennane and Rejdali, 2016).

In the literature, no data are available on the fumigant and repellent effects of the EOs of Z. hispanica and S. calamintha on the cowpea insect pest C. maculatus (Fabricius). Indeed, the only study mentioning the insecticidal activity of Z. hispanica EO was carried out on Bruchus lentis, Bruchus pisorum, and Bruchus rufimanus (Coleoptera: Bruchidae) (Ainane et al., 2023). On the other hand, research conducted on the insecticidal potential of S. calamitha EO was only focused on Tribolium confusum (Duv.) (Coleoptera: Tenebrionidae), Rhyzopertha dominica (F.), and Sitophilus oryzae (L.) (Abbad et al., 2023). Therefore, the present study aimed to evaluate the toxicity and insecticidal power of EOs extracted from the two Moroccan medicinal and aromatic plants, on the biological parameters of C. maculatus under laboratory conditions and to profile the volatile compounds that are responsible for insecticidal activity.

Materials and methods

Mass breeding of the cowpea pest Callosobruchus maculatus

The insect selection, C. maculatus males and females (Figure 1), was obtained from a local storage site and reared in glass jars containing approximately 500 g of Vigna unguiculata seeds.

Figure 1

Figure 1. Adult of C. maculatus: female (A) and male (B) (photographs taken by Baghouz et al., 2022).

The jars were preserved under conditions of the culture chamber (temperature at 27 ± 1°C, relative humidity at 70 ± 5%, and a photoperiod of 14 h of light and 10 h of dark) (Baghouz et al., 2022).

Vegetal material and essential oil extraction

The aerial parts of Z. hispanica and S. calamintha were harvested in different regions of Morocco at the end of May and June 2021 (Figures 2, 3). The determination of the names of these two plants was carried out by the botanical professor, Amina Bari, who assigned them the voucher numbers (Table 1). The aerial parts (leaves and flowers) of these plants were cleaned and dried in the shade at room temperature (25–27°C during the day) for 15 days, then ground to a fine powder using an electric blender.

Figure 2

Figure 2. Ziziphora hispanica on its natural habitat in the Guigou region (Boulemane, Morocco, May 2021) (photo taken by Baghouz et al., 2022).

Figure 3

Figure 3. Satureja calamintha on its natural habitat in Jbabra region (Taounate, Morocco, June 2021) (photo taken by Baghouz et al., 2022).

Table 1

Table 1. Distinctive properties of Z. hispanica and S. calamintha plants used against cowpea pest.

In the present study, a Clevenger-type hydrodistillation apparatus was used to extract the essential oils for 3 to 4 h. One liter of distilled water was poured into a flask containing 100 g of dry leaf powder from each plants tested, and the whole was boiled until two phases appeared, one aqueous and other organic (essential oil). The essential oils were collected using a graduated burette, stored in airtight opaque tubes, and kept in the refrigerator at a temperature of around 4°C.

The essential oil content of the two plants was determined by applying the formula below (Piri et al., 2019):

$Y=\frac{m1}{\mathrm{m}2}\times 100$

R: yield of essential oils expressed in (%).

m 1: mass of essential oils in g.

m 2: mass of plant material in g.

Analysis of the chemical composition of EOs by GC–MS

The chemical composition of the essential oils was determined using a gas chromatograph-mass spectrophotometer (Brand Agilent Technologies Model 5,973 with an Agilent column 19091S-433 HP-5MS, 30 m long, 0.25 mm inside diameter, and 0.25 μm film thickness of the stationary phase, Helsinki, Finland) in positive mode by injection of 0.1 μL of the sample to be analyzed. Helium was used as the carrier gas, with a typical pressure range (psi) of 0.9 mL/s. The oven temperature program was set between 60 and 300°C for 10 min, then held at 300°C for 20 min. The detector temperature was set at 250°C and the injector at 260°C. Compounds were identified by comparing retention times with those of standards obtained from the NIST mass spectra library (Jawhari et al., 2020).

Fumigation bioassay

One-liter jars were used for the essential oil fumigation assay (Figure 4). Both EOs were tested in the vapor phase to evaluate their insecticidal activity. First, Whatman paper discs (3 cm²) were impregnated with different concentrations of the EOs (4, 8, 12, 16, and 20 μL/L of air) and attached to the inner surface of the jar lids to prevent direct contact with the insects. Next, 10 g of healthy cowpea seeds and five pairs of C. maculatus aged 0–48 h were introduced in each jar, whereas the control was performed without EO. Three replicates are performed for each assay. Then, the jars were kept in the culture chamber (Baghouz et al., 2022), and the biology of the cowpea beetle (C. maculatus) was observed and recorded regularly.

Figure 4

Figure 4. Methods used for the fumigation test with EOs on the biology of cowpea beetle.

The mortality rate observed was corrected by the Abbott formula (Abbott, 1925):

$\mathrm{P}\mathrm{c}=\frac{Po-Pt}{100-Pt}\times 100$

Pc: Corrected mortality; Po: Observed mortality; Pt: Control mortality.

Female fecundity is the total number of eggs laid by C. maculatus females (hatched and unhatched).

Female fertility (Hatching rate) = (Number of eggs hatched/Number of eggs laid) × 100.

Repellency bioassay

The repellency of the EOs on C. maculatus adults was studied by the preferential surface method on filter paper, following the technique described by McDonald et al. (1970). With Whatman No. 1 paper washers (8 cm² in diameter), cut transversely into two identical parts, the first was treated with each essential oil evaluated at different concentrations (4, 12, 16, and 20 μL/cm²) diluted in 0.5 mL of acetone, and the second was treated exclusively with the same volume of acetone established as the control (McDonald et al., 1970). After air-drying both parts, five pairs of adult C. maculatus were placed in the center of each plate. After 30 min following the test, the insects found on both sides were counted. Three replicates are performed for each assay (Figure 5). The Percentage of repulsion (PR) was calculated using the following formula:

$\mathrm{P}\mathrm{R}\left(\%\right)=\frac{\mathrm{N}-\mathrm{N}\mathrm{T}}{\mathrm{N}+\mathrm{N}\mathrm{T}}\times 100$

PR: Percentage of repulsion; N: Number of individuals present in part treated with acetone only; NT: Number of individuals present in part treated with the essential oil diluted in acetone.

Figure 5

Figure 5. Methods used for the Repellency Test with EOs.

Statistical analysis

To identify any significant differences between the effects of Z. hispanica and S. calamintha EOs on C. maculatus, an analysis of variance (two-way ANOVA) was performed, and significant means ± SD of the treatments were separated using Tukey’s multiple interval tests at p < 0.05 using GraphPad Prism 8. In the fumigation tests, the lethal concentrations (LC₅₀ and LC₉₀) and chi-square for each regression coefficient were determined by Probit analysis (Finney, 1971) using SPSS version 21 software. For repellency tests, counts of insects attracted to each concentration of product and control were compared to Tukey’s at p < 0.05, using graph pad prism 8 software.

Results

Chemical composition and yield of essential oils

The yield of Z. hispanica EO was 0.85% based on the dry matter, and GC/MS phytochemical analysis of the EO revealed 23 compounds, which represent 99.99% of the total composition of the oil. The detected volatiles were distinguished at 5.14 and 9.18 min. The EO was rich in oxygenated monoterpenes, which dominated its composition (34.97%). The major constituents that make up this class are pulegone (28.17%), trans-isopulegone (3.09%), and piperenone oxide (1.40%). Moreover, we also detected new compounds present in considerable proportions, including alpha-naphtonitrite (10.77%), 3-(3-thienyl) pro-2-enoic acid (10.62%), and + (3)-methyladipic acid (9.59%) (Table 2).

Table 2

Table 2. Chemical composition of Z. hispanica EO detected by GC–MS.

The yield of S. calamintha EO was 1.40% based on the dry matter. It was confirmed by GC/MS the presence of 24 compounds, forming 99.43%, which were shown between 4.414 and 9.622 min. S. calamintha EO has a large quantity of oxygenated monoterpenes, which constitute 75.46%, and the main constituents make up this class are pulegone (20.53%), piperenone oxide (17.05%), and 1,8-cineole (12.09%). At the same time, it’s also noted the presence of oxygenated sesquiterpenes with a content of 10.44% and composed mainly of spathulenol (9.14%) (Table 3).

Table 3

Table 3. Chemical composition of S. calamintha EO detected by GC–MS.

Effect of EOs on adult mortality

The effects of Z. hispanica and S. calamintha EOs vapors on the mortality of adult males and females of C. maculatus, show that males are more sensitive than females to the EOs tested (Table 4).

Table 4

Table 4. Effect of EOs on C. maculatus mortality.

Indeed, at the lowest concentration (4 μL/L), Z. hispanica EO causes 80 ± 20% mortality of C. maculatus males and 66.66 ± 11.54% of females after 24 h of exposure. Z. hispanica EO showed highly significant mortality with increasing concentrations (F = 805.64; df = 5.72; p < 0.0001) and exposure times (F = 49.16; df = 5.72; p < 0.0001) for males. Similarly, this mortality was significant for females at different concentrations (F = 1331.70; df = 5.72; p < 0.0001) and equivalent exposure durations (F = 94.20; df = 5.72; p < 0.0001).

At the same concentration (4 μL/L), S. calamintha EO causes 100% mortality of males and 86.66 ± 23.09% of females after 24 h. However, no mortality occurred in the control groups. The insecticidal potential of S. calamintha EO was manifested by very high and significant mortality in males, observed at various concentrations (F = 2048; df = 5.72; p < 0.0001) and exposure times (F = 102.80; df = 5.72; p < 0.0001). In parallel, significant mortality was observed in females at different concentrations (F = 805.64; df = 5.72; p < 0.0001) and exposure times (F = 49.16; df = 5.72; p < 0.0001).

At the highest concentration (20 μL/L), Z. hispanica and S. calamintha oils show significantly higher action than the control, causing 100% mortality, respectively, for both sexes.

Probit analysis of the two plant EOs showed variable efficacy against C. maculatus, with greater sensitivity among adult males than adult females.

The S. calamintha EO showed the highest fumigation activity against C. maculatus with an LC₅₀ value of 2.17 μL/insect for females; on the other hand, the LC₅₀ value of the Z. hispanica EO recorded is 3.57 μL/insect for the same sex after 24 h of exposure (Table 5).

Table 5

Table 5. Lethal concentrations (μL/L) and chi-square values (χ²) for EOs against adult C. maculatus.

Effect of EOs on fecundity, fertility of females and adult emergence

The fumigation test with Z. hispanica and S. calamintha EOs induced a repressive effect on different biological parameters of C. maculatus.

Given the early mortality of C. maculatus adults, it is clear that low concentrations (4 μL, 8 μL) of EOs completely prevented egg-laying, fertility of females and inhibited the emergence of C. maculatus adults, as indicated in Figure 6.

Figure 6

Figure 6. Impact of EOs of Z. hispanica and S. calamintha on biological parameters of C. maculatus (mean ± SD).

Repellency bioassay

The repellent properties of Z. hispanica and S. calamintha oils were studied on C. maculatus adults at different concentrations (between 4 and 20 μL). The highest repellent activity (100%) was recorded at a concentration of 16 μL after 30 min for S. calamintha EO against C. maculatus adults, while (93.33%) was observed at the same concentration for Z. hispanica EO (Table 6). The repellency test revealed a highly significant toxicity caused by both EOs against C. maculatus, and this was dependent on concentration (F = 9.067; df = 3.8; p = 0.0059).

Table 6

Table 6. Repellency of the EOs against the cowpea pest C. maculatus.

Discussion

In this study, Z. hispanica and S. calamintha EOs isolated by Clevenger hydrodistillation yielded 0.85% for Z. hispanica and 1.40% for S. calamintha. Various studies have quantified the EO content of these species. Z. hispanica yields have been measured at 1.38, 0.53, and 1.01% (v/w), respectively, in some studies (Negueruela and Rico, 1986; Bekhechi et al., 2007; Rabah et al., 2013). The yields of S. calamintha obtained by different researchers are 1.3, 2.54, and 2.80% (v/w), respectively (Kerbouche et al., 2013; Bouzidi and Kemieg, 2021; El Brahimi et al., 2023). In fact, variations in EO content depend on various parameters, including soil type, geographical region, harvesting time, plant material qualification, and extraction process (Hussain et al., 2010; Gharib et al., 2020; Marques et al., 2023).

Results showed that the EOs extracted from two lamiacae plants have insecticidal activity against the males and females of C. maculatus. However, the toxicity varied according to the plant and exposure time. The plant species considered in this study are recognized for their environmentally friendly characteristics and safety for vertebrates, and they are also used in the medical field. The studies on the toxicity of Z. hispanica and S. calamintha on the cowpea pest are nonexistent, and no studies have been reported in the literature on the insecticidal activity of fumigants and the repellent power of EOs tested against stored product insects, especially C. maculatus. Our results showed that both EOs caused mortality of C. maculatus adults within 24 h of treatment. The EO of S. calamintha had the most significant insecticidal action, as the lowest concentration (4 μL/L), resulting in 100% mortality of males and 60.44 ± 3.35% of females. Several previous studies have demonstrated the effectiveness of Lamiaceae species EOs by fumigation on several insect pests, such as C. maculatus (Demirel and Erdogan, 2017; Baghouz et al., 2022; Yang et al., 2023). And Tribolium castaneum (Jaya et al., 2014). The insecticidal potential of S. calamintha EO against three species of stored grain insects (Tribolium confusum, Rhyzopertha dominica, and Sitophilus oryzae) was more pronounced than that observed with other plants (Alkan, 2020; Abbad et al., 2023). The LC₅₀ values obtained by S. calamintha EO are considerably lower than those reported for several traditional insecticides used against insect pests (Yao et al., 2019; Attia et al., 2020).

This research shows that both EOs significantly reduce the number of eggs laid per female, fertility, and adult emergence of C. maculatus from the lowest concentration (4 μL). The mean number of eggs laid per female was 1.33 ± 0.577 eggs for Z. hispanica and 0 ± 0 for S. calamintha, compared with the control which had 196.66 ± 11.54 eggs. This indicates the presence of volatile components in EOs that obstruct egg-laying and larval development inside the seeds, thus preventing the emergence of adults. Our results concur with those of several researchers. Lolestani and Shayesteh (2009) studied the toxicity of Z. clinopodioides EO on the fecundity of C. maculatus females and reported 61.10% egg mortality at a concentration of 26.7 μL/L of air. In addition, Kheirkhah et al. (2015) found a strong ovicidal activity of Z. clinopodioides EO against the flour beetle E. kuehniella. Saeidi and Mirfakhraie (2017) determined that Mentha piperita EO has high repellent efficacy against C. maculatus, with a repellent percentage of 87.76 ± 0.96% at a dose of 360 μL/L of air after 24 h of exposure. Satongrod and Wanna (2020) proved that the EO of P. amboinicus showed the highest efficacy for repelling C. maculatus adults (87.50 ± 5%) at a concentration of 1 μL/L air after 48 h.

The male and female adults of C. maculatus showed a high sensitivity to the EOs, even at low concentrations and during short exposure times. Based on the results obtained, it is suggested that the insecticidal potential of both EOs could be attributed mainly to the presence of high quantities of the main monoterpene components (Abeywickrama et al., 2006; Abdelgaleil et al., 2009; Saeidi and Mirfakhraie, 2017; Romani et al., 2019; Abifarin et al., 2020; Boukraa et al., 2022). The EOs of many plants are rich in secondary metabolites, particularly monoterpenes, which confer insecticidal properties (Topuz et al., 2018; Hategekimana and Erler, 2020a; Gupta et al., 2023). These substances are highly volatile, resulting in potentially significant fumigant and repellent properties for controlling infestations of insect pests in stored products (Martynov et al., 2019). Consequently, these biochemical substances impact negatively on female fecundity and fertility, as well as on adult emergence (Saeidi and Mirfakhraie, 2017; Romani et al., 2019; Boukraa et al., 2022). The repellent effect resides in various behavioral responses of the insects transmitted by sensory hairs in their antennae that detect the chemically volatile organic compounds in the EOs (Romani et al., 2019; De Brito et al., 2021; Boukraa et al., 2022).

Pulegone, a monoterpenoid compound, constitutes the main component of Z. hispanica and S. calamintha EOs. Various studies have reported its insecticidal activity (Ainane et al., 2023). This compound is present in several Lamiaceae EOs and has a significant defensive role thanks to its repellent properties (Dancewicz et al., 2008). It can disrupt the reproduction, nutrition, growth, and embryonic development of certain insect species (Gunderson et al., 1985). Its toxic effect on various insects has been demonstrated and confirmed by Sousa et al. (2022).

Based on the present research findings, we suggest that the insecticidal activity observed against the different biological parameters of the cowpea pest C. maculatus, could be attributed to the high quantity of pulegone present in both EOs. Our observations confirm the findings of Božović and Ragno (2017), highlighting that pulegone is the most active compound among 20 monoterpenoids tested, causing a mortality rate of 100% in all five insect species tested (Sitophilus oryzae, Tribolium castaneum, Oryzaephilus surinamensis, Musca domestica, and Blattella germanica) at a dose of 50 mg/Lair. The pulegone exhibits a very high fumigation toxicity against adults of S. zeamais and T. castaneum (with LC₅₀ = 3.47 and 11.56 mg cm⁻³, respectively) after 7 days of exposure; it proved more toxic than menthone, which presented LC₅₀ values of 10.32 and 31.25 mg cm-3, respectively, against these pests (Koul et al., 2008; Liu et al., 2011). Pulegone appears as a potential useful element in the management of the corn weevil, S. zeamais, being the only compound that caused insect mortality among other bioactive compounds tested (Peschiutta et al., 2019). The fumigation toxicity of pulegone was higher than that of carvone and E-Z-ocimene against S. zeamais (Herrera et al., 2014).

The early mortality of C. maculatus adults, suggests that the action mode of the two EOs could be explained by the fumigant’s toxicity, which enters the insect’s body via its respiratory system. This can be explained as the fumigant and repellent properties of these EOs could concurrently influence different olfactory receptor neurons. Furthermore, monoterpenes are potent neurotoxins that could affect the inhibition of acetylcholinesterase enzyme in the central nervous system (Abdelgaleil et al., 2009; Abou-Taleb et al., 2016; Saad et al., 2018).

At the same time, various studies have confirmed that certain botanical pesticides interfere with the functioning of ion channels (“chloride channels” and “sodium channels” associated with glutamate) and block the action of acetylcholinesterase (AChE), leading to the suppression of neurons in insects and their eventual death. In some cases, insecticide toxicity results from the inhibition of mitochondrial activity by interruption of the protein phosphorylation process, and of chemosensory receptor cells via suppression of glucose and inositol stimulation (Rattan, 2010; Lengai et al., 2020; Rösner et al., 2020). Kiran and Prakash (2015) reported that inhibition of AChE function and changes in the antioxidant defense system, superoxide dismutase, catalase, glutathione, and oxidized glutathione, are related to the insecticidal potential exerted by Gaultheria procumbens L. EO. The work of Liao et al. (2016) notes the correlation between the insecticidal activity of Melaleuca alternifolia EO and changes in enzyme function (glutathione S-transferase, carboxylesterase, and acetylcholinesterase), including cytochrome P450, CarE, GST, and ATP-binding cassette transporters, against S. zeamais beetle. In accordance with some previous findings, certain EOs and monoterpenes have been described as AChE inhibitors or as positive allosteric modulators of GABA receptors (Miyazawa et al., 1997; Abdelgaleil et al., 2009; Abbad et al., 2023). Additionally, it was shown that the pulegone monoterpene has a high binding affinity for tyraminergic receptors, which play a crucial role in various vital insect physiological functions, including locomotion, reproduction, and response to pheromones (Ocampo et al., 2020).

It appears from the results obtained that the combination of components has increased efficacy, which could explain the effect of the minority compounds. The minor compounds in EOs play an important role in ensuring effective biological activity, reinforcing the results, and providing additional benefits (El-Shemy, 2018).

In fact, the minor constituents of EOs act synergistically, contributing to their effectiveness against insect pests (Linghu et al., 2016). Feng et al. (2020) pointed out that the minor components could play a crucial role in the toxicity of Valerianaceae species EOs against the red flour beetle Tribolium castaneum. Hategekimana and Erler (2020b) proved that the minor constituents of EOs played a significant role in insecticidal efficacy, highlighting the essential role of the complex composition of these oils in the expression of insecticidal properties.

The use of these EOs to combat insect pests in developing countries like Morocco, where plant biodiversity is rich and unique, is referred to as “green pesticides.” Their large-scale success would represent a veritable revolution in sustainable, environmentally friendly pest control. The development of EO-based bioinsecticides is booming, and expansion into existing and new markets is expected over the next decade (Isman, 2020). In this context, the successful use of EOs as biopesticides depends on a combination of factors: product availability, competitive pricing, and obtaining the necessary regulatory approvals (Isman, 2016).

The multitude of research projects dedicated to discovering new sources of insecticidal oils offer great potential, but the commercialization of new products remains uncertain and will depend on the ability to overcome challenges related to efficacy, safety, and production costs (Isman, 2017). This highlights the importance of close collaboration between researchers, developers, and industry to optimize the potential of essential oil-based bioinsecticides and meet the growing demand for sustainable pest management solutions.

Conclusion

The results of the present study suggest that the fumigant and repellent effects of Z. hispanica and S. calamintha EOs can affect the biological parameters of the cowpea insect pest C. maculatus. Our findings agree with the previous works, which indicate the success of plant EOs as bio-insecticides for the management of food products against the attacks of stored seed pests. The data revealed the high insecticidal efficacy of both EOs against adult males and females of C. maculatus. This could be attributed to its high volatility and its fumigant and repellent properties. Therefore, the EOs can serve as an ecological and efficient alternative for preserving stored food and reducing the issues associated with the use of synthetic insecticides. Further research is needed to deepen knowledge of these methods so that they can be used effectively and on a large scale, particularly in commercial applications. The formulation of these procedures is also essential. Additionally, their effectiveness in grain storage systems should be studied, and their odor should be fixed by appropriate methods. Finally, it is crucial to assess their potential toxicity to non-target organisms and humans to ensure their biosafety and enhance their credibility.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding authors.

Ethics statement

The animal study was approved by the Ethical Institutional Committee for the University Sidi Mohamed Ben Abdallah approved the protocol. All of the experimental proceedings using laboratory animals followed the Organization for Economic Cooperation and Development (OECD) guidelines 423. The study was conducted in accordance with the local legislation and institutional requirements.

Author contributions

AB: Conceptualization, Formal analysis, Methodology, Writing – original draft. YB: Conceptualization, Formal analysis, Methodology, Writing – review & editing. IE-s: Conceptualization, Writing – review & editing. RE: Data curation, Formal analysis, Writing – review & editing. HI: Data curation, Resources, Writing – review & editing. MA: Resources, Writing – review & editing. ON: Resources, Writing – review & editing. AS: Resources, Writing – review & editing. RG: Supervision, Writing – review & editing.

Funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This study was funded by the Princess Nourah bint Abdulrahman University, Researchers Supporting Project number (PNURSP2024R103), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. Also funded by Researchers Supporting Project Number (RSPD2024R1057), King Saud University, Riyadh, Saudi Arabia.

Acknowledgments

The authors extend their appreciation to Princess Nourah bint Abdulrahman University Researchers Supporting Project Number (PNURSP2024R103), Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia. The authors are also thankful to Researchers Supporting Project Number (RSPD2024R1057), King Saud University, Riyadh, Saudi Arabia.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fsufs.2024.1329100/full#supplementary-material

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