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ORIGINAL RESEARCH article

Front. Agron., 19 May 2021
Sec. Pest Management
This article is part of the Research Topic The Use of Plant Extracts and Essential Oils as Biopesticides View all 12 articles

Acaricidal and Insect Antifeedant Effects of Essential Oils From Selected Aromatic Plants and Their Main Components

\nFlix ValcrcelFélix Valcárcel1A. Sonia Olmeda
A. Sonia Olmeda2*Marta G. GonzlezMarta G. González1Maria Fe AndrsMaria Fe Andrés3Juliana Navarro-RochaJuliana Navarro-Rocha4Azucena Gonzlez-Coloma
Azucena González-Coloma3*
  • 1Grupo de Parasitología Animal, Departamento de Reproducción Animal, Instituto Nacional de Investigaciones Agrarias (INIA), Madrid, Spain
  • 2Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid (UCM), Madrid, Spain
  • 3Instituto de Ciencias Agrarias, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
  • 4Unidad de Recursos Forestales, Centro de Investigación y Tecnología Agraria de Aragón (CITA), Zaragoza, Spain

This work has demonstrated the ixodicidal and insect antifeedant effects of essential oils from 14 experimentally cultivated aromatic plants. The strong ixodicidal and antifeedant oils corresponded to Thymus zygis, Thymus vulgaris, Satureja montana, Oreganum virens, and Mentha suaveolens. The moderately active oils were from Lavandula angustifolia, Mentha piperita, Mentha spicata, Artemisa herba-alba, and Rosmarinus officinalis. The most effective larvicidal and antifeedant compounds were piperitenone oxide, carvacrol, piperitenone, and thymol, explaining the effects of the most active essential oils. The rest of the tested compounds were not ixodicidal or antifeedant. Therefore, the activity of moderately active oils cannot be explained by their main components (linalyl acetate, linalool, menthone, menthol, limonene, camphor, 1,8-cineole, p-cymene, α-pìnene, and carvone), suggesting synergistic effects. Considering the ixodicidal and antifeedant effects of these extracts, the plants have been ranked in relation to Thymus vulgare, a commercial biopesticide ingredient, for their potential as botanical pesticides. T. zygis, S. montana, and M. suaveolens ranked over T. vulgaris as ixodicidal agents and S. montana as insecticidal. Therefore, we propose the plant populations of S. montana, T. zygis, and M. suaveolens tested here for further development as biopesticide ingredients.

Introduction

Food safety and environmental concerns related to the use of pesticides have resulted in more restricted regulatory frameworks worldwide, reducing the number of commercial products available for crop protection and other pest management sectors including the control of vectors of human and livestock diseases. Therefore, new safer and effective insecticides are needed. Botanical pesticides are emerging as a solution to meet part of the demand (Isman, 2020a). Essential oils (EOs) that are composed of volatile secondary metabolites, mostly terpenes (Bakkali et al., 2008), are among the most important extracts acting as botanical insecticides (Regnault-Roger et al., 2012; Pavela and Benelli, 2016), and some are being commercialized as commercial pesticide ingredients (Isman, 2020b).

Arthropods, including economically important disease vectors and insect pests, are an important target of the biological effects of EOs (Ntalli et al., 2019; Isman, 2020a,b). Tick-borne diseases are a serious health and economic problem, responsible for over 100,000 cases of human diseases worldwide (de la Fuente et al., 2008) and billions of dollars in losses to the livestock industry (Lotfi and Karima, 2020). Additionally, ticks are in expansion due to climate change (Abbas et al., 2018). For example, Hyalomma ticks, vectors of the Crimean-Congo hemorrhagic fever virus, have spread from their original distribution (African and Mediterranean environments) to other European countries, becoming an increasing public health concern (Chitimia-Dobler et al., 2019; Hansford et al., 2019; Buczek et al., 2020; Grandi et al., 2020). For many years, tick control has been carried out with synthetic acaricides, leading to the appearance of resistance (reviewed by Abbas et al., 2014) and being harmful to the environment. Therefore, new effective and safer tick control agents are needed. In this context, EOs have been reported as being toxic and/or repellent to ticks (Benelli et al., 2016, 2017a; Benelli and Pavela, 2018; Salman et al., 2020).

Crop yield damages caused by pest infestations and pesticide use are significant (Oerke, 2006; Gregory et al., 2009) and increasing with global warming. Adaptation measures to increased pest damage related to global warming may involve greater use of pesticides with detrimental effects on health, environmental damage, and increased pesticide resistance (Deutsch et al., 2018). Some important crop pests include the Egyptian cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae), a highly polyphagous insect labeled as an A2 quarantine pest by the OEPP/EPPO (2015) due to its host range (Alford, 2007) and distribution (Centre for Agricultural Bioscience International, 2020a). The green peach aphid, Myzus persicae Sulzer (Hemiptera: Aphididae), is the most economically important aphid crop pest worldwide (van Emden and Harrington, 2017) due to its distribution (Centre for Agricultural Bioscience International, 2020b), host range (Blackman and Eastop, 2000), mechanisms of plant damage, life cycle, and its ability to evolve resistance to insecticides (Bass et al., 2014). The bird cherry-oat aphid, Rhopalosiphum padi L., is a global pest of cereals (van Emden and Harrington, 2017) and a vector of yellow dwarf viruses that cause significant crop losses in cereals (Finlay and Luck, 2011). Many EOs are good insecticidal candidates because of their direct effects, biodegradability, and their low level of toxicity to mammals (Isman, 2020a,b).

The commercial production of a botanical insecticide depends on the sustainable production of plant biomass for extraction. Therefore, the domestication and cultivation of aromatic and medicinal plants (AMPs) for the production of EOs contributes to species conservation and provides sustainability of the production and lower variations in active ingredients. For example, a selected chemotype of wormwood, Artemisia absinthium (Asteraceae), that lacks the toxic terpene β-thujone but produces other novel terpenoids that are toxic and antifeedant to a range of pest insects has been domesticated for cultivation and registered as a new plant variety (Gonzalez-Coloma et al., 2017).

As part of an ongoing project on the domestication and valorization of selected AMPs, plant species belonging to the genera Artemisia, Hyssopus, Lavandula, Mentha, Origanum, Rosmarinus, Satureja, Tanacetum, and Thymus have been experimentally cultivated at a small scale. These genera include species traditionally used in medicinal, food, and flavor applications due to their contents in bioactive EOs (Fathiazad and Hamedeyazdan, 2011; Chishti et al., 2013; Kumar and Tyagi, 2013; Tepe and Cilkiz, 2016; Aprotosoaie et al., 2017; Singh and Pandey, 2018; Borges et al., 2019; Li et al., 2019; Isman, 2020a,b).

In this work, essential oils from selected species of aromatic and medicinal plants cultivated experimentally (Table 1) have been evaluated against arthropods of importance in public health and animal and crop production: the tick (Hyalomma lusitanicum) and three insect pests (S. littoralis, M. persicae, and R. padi). Thymus vulgaris has been included in this study as a reference to compare the rest of the selected species because it is one of the most important aromatic plants grown worldwide (Southern and Central Europe, Southeast Asia, North America, and Africa), and it is an ingredient of botanical insecticides because of its thymol content (Pavela, 2016). Additionally, the composition of the most active EOs has been analyzed and the ixodicidal and insecticidal activities of their main components (Figure 1) tested.

TABLE 1
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Table 1. List of the plant species used and their origin (experimental field locations in Aragón, Spain, and UTM coordinates).

FIGURE 1
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Figure 1. Chemical structures of the essentail oils main components.

Materials and Methods

Plant Material

Fourteen plant species belonging to the families Asteraceae and Lamiaceae (Table 1) were selected for the study. The plants come from Spanish native flora and have been experimentally cultivated in several locations in Aragon (Spain) as described (Burillo, 2003; Burillo et al., 2017; Navarro-Rocha et al., 2020).

Aerial parts of these plants were collected at the flowering stage. EOs were obtained in the laboratory by Clevenger hydrodistillation (European Pharmacopoeia, 1975).

Essential Oil Analysis

The essential oils were analyzed by gas chromatography–mass spectrometry (GC-MS) using a Shimadzu GC-2010 gas chromatograph coupled to a Shimadzu GCMS-QP2010 Ultra mass detector (electron ionization, 70 eV) and equipped with a 30-m × 0.25-mm i.d. capillary column (0.25 μm film thickness) Teknokroma TRB-5 (95%) dimethyl–(5%) diphenylpolisiloxane. The working conditions were as follows: split ratio, 20:1; injector temperature, 300°C; temperature of the transfer line connected to the mass spectrometer, 250°C; initial column temperature, 70°C; then heated to 290°C at 6°C/min. The relative amounts of the individual components were calculated based on the peak area without using a correction factor. Electron ionization mass spectra, retention data, and the calculated linear retention indices (LRIs) were used to assess the identity of the compounds by comparing them with those of standards or those found in the Wiley 229 Mass Spectral Database.

Ixodicidal Activity

Hyalomma lusitanicum engorged females were collected from red deer in Ciudad Real (Central Spain) and maintained under laboratory conditions [22–24°C and 80% relative humidity (RH)] until oviposition and egg hatching.

Tick bioassays were performed according to Ruiz-Vásquez et al. (2017). Briefly, 50 μl of the test solution was added to 25 mg of powdered cellulose at different concentrations (initial concentration of 40 or 20 μg/mg for EOs or pure compounds, respectively) and the solvent was evaporated. The ticks and cellulose were then placed in laboratory glass tubes and carefully mixed by rotating the glass several times to ensure full tick–cellulose contact. After mixing, the tubes were kept under laboratory conditions for 24 h. For each test, three replicates with 20 active older than 6 weeks larvae. To validate the tests, three replicates of negative (cellulose, 25 mg) and positive (thymol, 20 μg/mg) controls were also used.

Ticks were considered dead when they could not move from one place to another. Dead ticks were counted after 24 h of contact with the treated cellulose at the laboratory conditions described using a binocular magnifying glass. The larvicidal activity data are presented as percent mortality corrected according to Schneider–Orelli's formula (Püntener, 1981). Effective lethal doses (LC50 and LC90) were calculated by Probit analysis (1:2 serial dilutions to cover a range of activities between 100 and <50% mortality with a minimum of three doses) (STATGRAPHICS Centurion XVI, version 16.1.02).

Insect Antifeedant Activity

Spodoptera littoralis, M. persicae, and R. padi colonies are maintained at ICA-CSIC, reared on artificial diet, bell pepper (Capsicum annuum) and barley (Hordeum vulgare) plants, respectively, and kept at 22 ± 1°C and >70% RH, with a photoperiod of 16:8 h (L/D) in a custom-made walk-in growth chamber.

The bioassays were conducted as described (Navarro-Rocha et al., 2018). The upper surfaces of the C. annuum and H. vulgare leaf disks or fragments (1.0 cm2) were treated with 10 μl of the test substance. The EOs and products were tested at an initial dose of 10 or 5 μg/μl (100 or 50 μg/cm2), respectively. Five to seven Petri dishes or 20 ventilated plastic boxes (2 × 2 cm) with two sixth-instar S. littoralis larvae (>24 h after molting) or 10 apterous aphid adults (24–48 h old) each were allowed to feed in a growth chamber (until 75% larval consumption of the control disks or 24 h for aphids, environmental conditions as above). Each experiment was repeated twice. Feeding inhibition or aphid settling was calculated by measuring the disk surface consumption (digitalized with https://imagej.nih.gov/ij/) (Rueden et al., 2017) or by counting the number of aphids on each leaf fragment. Feeding/settling inhibition (%FI or %SI) was calculated as %FI/SI = [1 – (T/C) × 100], where T and C represent feeding/settling on the treated and control leaf disks, respectively. The antifeedant effects (%FI/SI) were analyzed for significance by the non-parametric Wilcoxon paired signed-rank test comparing the consumption/settling between the treatment and control leaf disks. Extracts and compounds with an SI >70% were further tested in a dose–response experiment (1:2 serial dilutions to cover a range of activities between 100 and <50% feeding inhibition with a minimum of three doses) to calculate their relative potency (EC50, the effective dose to give a 50% settling reduction) from the linear regression analysis (%FI/SI on Log-dose, STATGRAPHICS Centurion XVI, version 16.1.02).

Results

Ixodicidal Effects

Most of the EOs tested (75%) gave significant ixodicidal activity against H. lusitanicum larvae (Table 2), which can be grouped into four categories as follows:

(1) Strong ixodicidal effects (LC50 < 10 μg/mg): Thymus zygis (four doses tested, 100–46% mortality), followed by Mentha suaveolens (five doses tested, 100–50% mortality), Satureja montana (seven doses tested, 100–18% mortality), T. vulgaris (four doses tested, 100–5% mortality), and Origanum vulgare subsp. virens (six doses tested, 100–10% mortality).

(2) Moderate ixodicidal effects (LC50 < 16–28 μg/mg): Mentha piperita (three doses, 100–2% mortality), Mentha spicata (three doses, 100–9% mortality), Lavandula angustifolia (two doses, 92–2% mortality), and Rosmarinus officinalis (two doses, 100–20% mortality).

(3) Moderate–low ixodicidal effects (LC50 < 20–40 μg/mg): Artemisia herba-alba, only toxic at the highest dose tested (40 μg/mg, 100% mortality).

(4) No ixodicidal effects (LC50 > 40 μg/mg): Artemisia dranunculus, Hyssopus officinalis, Tanacetum vulgare, and Thymus mastichina.

TABLE 2
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Table 2. Larvicidal effects of the selected essential oils on Hyalomma lusitanicum.

Antifeedant Effects

Table 3 shows the insect antifeedant effects of the tested EOs. Overall, the herbivorous insects were less affected by these EOs than the tick (37 and 31% EOs effective against S. littoralis and aphids, respectively).

TABLE 3
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Table 3. Insect antifeedant effects of the selected essential oils.

Spodoptera littoralis feeding was strongly affected by S. montana (four doses, %FI = 90–5, EC50 = 39 μg/cm2), followed by M. piperita, M. spicata, T. vulgaris, T. zygis, and T. vulgare (%FI = 70–80).

Mentha persicae and R. padi were strongly affected by T. vulgaris (four doses, %SI = 81–10 and 84–7, EC50 = 29 and 49 μg/cm2, respectively) and S. montana (four doses, %SI = 90–5, EC50 = 29 μg/cm2). M. suaveolens (three doses, %SI = 92–20), O. vulgare subsp. virens (three doses, %SI = 78–10), and T. zygis (three doses, %SI = 89–15) showed moderate effects on M. persicae (EC50 = 35, 34, and 45 μg/cm2, respectively). T. zygis, T. vulgare, and O. vulgare subsp. virens had low effects on R. padi (%SI = 65–70).

Plant Species Ranking

Considering the ixodicidal and antifeedant effects of the tested EOs, the plants have been ranked in relation to T. vulgaris (Table 4) for their potential as botanical pesticide ingredients. The ranking index has been established as [T. vulgaris EC50 value/ranked species EC50 value] for each test with significant effects (see Tables 2, 3).

TABLE 4
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Table 4. Rank index [calculated as EC50 of Thymus vulgaris essential oil (EO)/EC50 of ranked species' EO] of the bioactive EO-producing plant species tested for further selection.

Overall, considering the sum of all the indices, S. montana and T. zygis ranked over T. vulgaris (value >4). However, T. zygis, S. montana, and M. suaveolens ranked over T. vulgaris as ixodicidal agents (>1), and only S. montana ranked better than T. vulgaris against insects (Table 4).

Essential Oil Composition

Table 5 shows the main components (% abundance >10) of the active EOs. The oils can be grouped according to their main components as follows: camphor/1,8-cineole (+p-cymene and A. herba-alba; +α-pìnene and R. officinalis); carvacrol (S. montana); carvone/1,8-cineole (M. spicata); p-cymene/carvacrol/linalool (O. vulgare subsp. virens); linalyl acetate/linalool (L. angustifolia); menthone/menthol/limonene (M. piperita); piperitenone oxide/piperitenone (M. suaveolens); and thymol (T. zygis) (+p-cymene and T. vulgaris).

TABLE 5
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Table 5. Main components of the active essential oils.

Ixodicidal and Antifeedant Effects of EOs' Main Components

Table 6 shows the ixodicidal effects of the selected individual components. Piperitenone oxide was the strongest acaricidal compound (LD50−90 = 0.9–1.1 μg/mg), followed by carvacrol (LD50−90 = 1.4–1.7 μg/mg), piperitenone (LD50−90 = 1.8–2.2 μg/mg), and thymol (LD50−90 = 2.9–6.2 μg/mg).

TABLE 6
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Table 6. Ixodicidal activity of the main components (% abundance > 10) of the active essential oils on Hyalomma lusitanicum larvae.

The antifeedant effects of the individual EO components are shown in Table 7. Piperitenone was the most effective antifeedant against S. littoralis (EC50 = 1.4 μg/cm2), followed by piperitenone oxide (EC50 = 5 μg/cm2), thymol (EC50 = 21 μg/cm2), and α-pinene with moderate-low effects (EC50 = ~37 μg/cm2). M. persicae strongly responded to thymol (EC50 = 7.6 μg/cm2) and piperitenone oxide (EC50 = 8.6 μg/cm2), followed by carvacrol (EC50 = 15 μg/cm2) and menthone (EC50 = ~34 μg/cm2). R. padi was the least sensitive insect species and responded to carvacrol (EC50 = 15 μg/cm2), thymol (EC50 = 19 μg/cm2), and piperitenone oxide (EC50 = ~25 μg/cm2).

TABLE 7
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Table 7. Antifeedant activity of the main components (% abundance >10) of the active essential oils on Spodoptera littoralis larvae, Myzus persicae, and Rhopaslosiphum padi apterous adults in choice tests.

Discussion

This work has demonstrated the ixodicidal and insect antifeedant effects of EOs from experimentally cultivated AMPs. Furthermore, more EOs were ixodicidals than insect antifeedants, probably because of their different feeding ecologies (blood sucking vs. herbivores). Ticks are obligate hematophagous ectoparasites (Basu and Charles, 2017) and therefore have not evolved adaptations to plant secondary metabolites. On the other hand, insect herbivores have coevolved with plants and their chemical defenses/secondary metabolites (Maron et al., 2019). These differences in feeding adaptations could explain the selective toxicity of EOs toward the ticks observed here.

The EOs grouped as strong ixodicidal agents corresponded to T. zygis, T. vulgaris, S. montana, M. suaveolens, and Origanum virens. Similarly, the EOs grouped as strong antifeedants corresponded to S. montana, T. zygis, and T. vulgaris, followed by O. virens and M. suaveolens.

Thymus vulgaris EO, an ingredient of botanical pesticides (Pavela, 2016), has been included in this work as a reference for further species selection. In this work, the EO from T. vulgaris (thymol/p-cymene) was the third most ixodicidal and the second most antifeedant against the insect species tested. The most common T. vulgaris chemotypes are thymol/carvacrol (György et al., 2020), which have reported ixodicidal effects including repellency against nymphs of Ixodes ricinus and adults of Dermacentor reticulatus (Štefanidesová et al., 2017; Goode et al., 2018), but not on its larvicidal effects against H. lusitanicum. EO from T. vulgaris has also been described as being insecticidal against several insect species, including S. littoralis, M. persicae (toxicity; Pavela, 2012; Ikbal and Pavela, 2019), and R. padi (antifeedant; Grul'ová et al., 2017). The EO from T. zygis (thymol) was the most effective ixodicidal agent tested here, with insect antifeedant effects similar to T. vulgaris. Previous reports showed that T. zygis EO (rich in thymol) was ovicidal, larvicidal, antifeedant, and repellent against the insect Plutella xylostella (Sangha et al., 2017), but this is the first report on its ixodicidal activity. T. zygis is distributed in the Iberian Peninsula and north of Africa (Morales Valverde, 1997), the thymol chemotype being of interest (Pérez-Sánchez et al., 2008). Therefore, the high content of thymol (75%) and the effects on ticks of the EO from the T. zygis line tested here support further agronomic development.

The EO from S. montana (carvacrol) was the most effective insect antifeedant and the second most effective ixodicidal agent tested in this study. The essential oil of S. montana is characterized by carvacrol, thymol, p-cymene, and linalool (Velasco and Perez-Alonso, 1983; Silva et al., 2009; Dunkic et al., 2012). S. montana EO has reported repellence to Frankiniella occidentalis (Picard et al., 2012), is toxic against Leptinotarsa decemlineata larvae and adults (Usanmaz-Bozhuyuk and Kordali, 2018), larvicidal against Culex quinquefasciatus (Benelli et al., 2017b), and toxic to Drosophila suzukii adults (Park et al., 2016). The population of S. montana used in this work, rich in carvacrol, has already been included in an agronomic development program for the production of biopesticides (Navarro-Rocha et al., 2020). However, this is the first report on the ixodicidal activity of this EO.

The M. suaveolens population selected for this work was rich in piperitenone oxide/piperitenone. This EO was the second most effective ixodicidal extract tested here (more effective than T. vulgaris), along with S. montana, and showed stronger antifeedant effects against M. persicae than T. vulgaris. M. suaveolens is native of Africa, temperate Asia, and Europe (Abbaszadeh et al., 2009). There are three chemotypes described for M. suaveolens: pulegone, piperitenone oxide, and piperitenone oxide/piperitone oxide (Oumzil et al., 2002; BoŽović et al., 2015). Previously, M. suaveolens EOs (pulegone and menthone) showed ovicidal and larvicidal effects against the tick Hyalomma aegyptium (Laghzaoui et al., 2019). This species' EOs also have reported insecticidal effects against stored-product pests such as Sitophilus oryzae (piperitenone oxide and piperitenone oxide/piperitenone chemotypes) (Zekri et al., 2013), Rizopertha dominica (piperitenone/pulegone/piperitone) (Benayad et al., 2012), and Triboleum castaneum (menthone/pulegone) (Kasrati et al., 2015) and larvicidal activity against C. quinquefasciatus (piperitenone oxide) (Pavela et al., 2014). Antifeedant effects against L. decemlineata and M. persicae have been reported for a piperitenone oxide/piperitone epoxide Mentha chemotype (Kimbaris et al., 2017). However, this is the first report on the ixodicidal effects of a piperitenone oxide/piperitenone M. suaveolens chemotype. The ixodicidal and antifeedant effects (stronger than those of T. vulgaris) of the M. suaveolens EO tested in this work support further agronomic development of this species for the production of biopesticides.

The chemotype of O. vulgare subsp. virens (p-cymene, carvacrol, and linalool) tested here showed ixodicidal effects similar to T. vulgaris, but was less antifeedant, affecting only the aphid M. persicae. O. vulgare have reported toxic or repellent activities against I. ricinus (Soutar et al., 2019) and acute and fumigant toxicity against aphids including M. persicae (Ikbal and Pavela, 2019). However, this is the first report on the ixodicidal and aphid antifeedant effects of O. vulgare subsp. virens EO. O. vulgare is a widespread species native to the Mediterranean, the Euro-Siberian, and the Irano-Turanian regions and is one of the most traded and consumed spice plants (Lukas et al., 2015). O. vulgare subsp. virens is a heterogeneous subspecies characterized by essential oils rich in acyclic and/or cymyl compounds (Lukas et al., 2015). Since the effects of the EO from O. vulgare subsp. virens tested here were similar to these of T. vulgaris, its further development for the production of biopesticides against arthropods is not supported. However, we suggest the valorization of its essential oil production residues (biomass: hydrolate) as a potential source of biopesticidal ingredients.

The moderate ixodicidal EOs were from L. angustifolia (linalyl acetate/linalool), M. piperita (menthone/menthol), M. spicata (carvone/1,8-cineole), R. officinalis (camphor/1,8-cineole/α-pinene), and A. herba-alba (camphor/1,8-cineole/p-cymene). All these EOs were less effective than that of T. vulgaris.

The EO from L. angustifolia tested here (linalyl acetate/linalool) showed moderate ixodicidal effects against H. luxitanicum larvae, lower than the effects of T. vulgaris, without significant insect antifeedant effects. Previous reports have shown interference with the host-seeking behaviors of H. marginatum and D. reticulatus for this species' EO (Mkolo and Magano, 2007; Štefanidesová et al., 2017) and toxicity to Rhipicephalus (Boophilus) annulatus (Pirali-Kheirabadi and Teixeira da Silva, 2010) for this species' EO. Additionally, a similar EO from the hybrid Lavandula × intermedia (rich in linalyl acetate and linalool) was also toxic to H. lusitanicum larvae and moderately antifeedant to S. littoralis (Ortiz de Elguea-Culebras et al., 2018). L. angustifolia, distributed in the sub-Mediterranean region, has a great economic importance in perfumery, cosmetics, food, pharmaceutical industries, and aromatherapy (Demasi et al., 2018). However, our results do not support its agronomic production as a biopesticide when compared to T. vulgaris, but suggest the valorization of its essential oil production residues (biomass: hydrolate) as a source of biopesticidal ingredients.

M. piperita (menthone/menthol) was moderately ixodicidal against H. lusitanicum and showed moderate antifeedant effects against S. littoralis. In previous works, M. piperita EO showed moderate repellency against adults of D. reticulatus (Štefanidesová et al., 2017), larvicidal effects against R. microplus (de Souza Chagas et al., 2016), and toxicity against aphids including M. persicae (Ikbal and Pavela, 2019). M. spicata (carvone/1,8-cineole) also had moderate larvicidal effects against H. lusitanicum and moderate-low antifeedant effects on S. littoralis. M. spicata EO has been reported as a moderate repellent against adults of D. reticulatus (Štefanidesová et al., 2017) and toxic to stored-product pests (Irfan et al., 2009; Kedia et al., 2014; Eliopoulos et al., 2015; Nubia et al., 2016), L. decemlineata (Saroukolai et al., 2014), and S. littoralis (Pavela, 2005), while a carvone/limonene chemotype of M. spicata was not antifeedant or toxic to S. littoralis, M. persicae, and R. padi (Santana et al., 2014). Mentha oils are used commercially as biopesticide ingredients because of their various effects against insects, the most commercialized being the Mentha species spearmint (M. spicata), peppermint (M. piperita), and M. arvensis (Singh and Pandey, 2018). Since our results showed lower effects than T. vulgaris, we suggest the valorization of their commercial essential oil production residues (biomass: hydrolate) as an additional source of biopesticidal ingredients.

Rosmarinus officinalis (camphor/1,8-cineole/α-pinene) showed moderate ixodicidal effects in this work. Previous reports have shown a moderate post-ingestive toxicity to S. littoralis for a similar R. officinalis EO (Santana et al., 2014). R. officinalis EOs rich in 1,8-cineole were toxic to larvae of Hyalomma scupense (Djebir et al., 2019) and I. ricinus nymphs (Elmhalli et al., 2019), while an EO rich in α-pinene showed low–moderate toxicity against larvae of R. (B.) microplus (Martinez-Velazquez et al., 2011). This plant is cultivated worldwide as a food flavoring and preservative due to its antioxidant and antimicrobial potential (Borges et al., 2019). Our results showed lower effects for R. officinalis than T. vulgaris. However, being a commercial plant available worldwide, we suggest the valorization of its essential oil production residues (biomass: hydrolate) as a source of biopesticidal ingredients.

The chemotype of A. herba-alba (camphor/1,8-cineole/p-cymene) tested in this work showed low–moderate larvicidal effects against H. lusitanicum. A. herba-alba is a medicinal and aromatic shrub that grows wild in arid areas of the Mediterranean Basin, being abundant in the Iberian Peninsula (Mohamed et al., 2010), showing chemical diversity (Salido et al., 2004). An A. herba-alba EO rich in piperitone showed repellency against I. ricinus nymphs (El-Seedi et al., 2017), and a thujone/camphor chemotype was antifeedant and moderately toxic to S. littoralis (Santana et al., 2014). Our results showed lower effects for a camphor/1,8-cineole A. herba-alba chemotype than those reported or T. vulgaris. Given the chemical diversity of A. herba-alba wild populations, we suggest further research on chemotype–bioactivity correlations for this plant species prior to its selection for agronomical development.

Considering the plant species' rank based on the ixodicidal and antifeedant effects of their EOs, we propose the plant populations of S. montana, T. zygis, and M. suaveolens tested here for further agronomical development as biopesticide ingredients for the control of ticks and insects. These EOs (S. montana, T. zygis, and M. suaveolens) have additional biopesticidal effects such as strong nematicidal action against root-knot nematodes (Meloidogyne javanica), with S. montana being the most effective (LC50 = 0.041 μg/μl) (Andrés et al., 2012).

To further understand the effects of the active EOs, their main components (Figure 1) were also tested against the selected targets. The most effective larvicidal and antifeedant compounds were piperitenone oxide, carvacrol, piperitenone, and thymol. The activity of piperitenone oxide and piperitenone explained the effects of M. suaveolens EO. Thymol explained the effects of the EOs from T. zygis and T. vulgaris, while carvacrol was responsible for the effects of S. montana and O. vulgare subsp. virens.

These compounds have reported ixodicidal and/or insecticidal effects. Piperitenone epoxide and piperitenone showed strong larvicidal and repellent effects against Aedes albopictus (Giatropoulos et al., 2018). Piperitenone was antifeedant to L. decemlineata and S. littoralis (Kimbaris et al., 2017). However, there are no reports on the acaricidal effects of these compounds. Thymol was larvicidal to H. lusitanicum (Navarro-Rocha et al., 2018), and carvacrol was toxic to Rhipicephalus turanicus (Coskun et al., 2008) and moderately toxic to Hyalomma marginatum adults (Cetin et al., 2010). These compounds were repellent to Amblyomma americanum (Carroll et al., 2017) and showed strong toxicity against I. ricinus larvae and repellency against I. ricinus larvae and A. americanum nymphs (Carroll et al., 2017; Tabari et al., 2017). Carvacrol and thymol also have reported behavioral and toxic effects against several insect species, including the ones targeted here. Specifically, thymol was antifeedant to M. persicae (Navarro-Rocha et al., 2018). Thymol and carvacrol were antifeedant to S. littoralis fourth-instar larvae (Pavela, 2011) and affected the olfactory sensilla of female S. littoralis adults (Anderson et al., 1993). Additionally, carvacrol and thymol showed acute toxicity to S. littoralis third-instar larvae (Pavela, 2014), and carvacrol was toxic to M. persicae (Petrakis et al., 2014).

The rest of the tested compounds were not ixodicidal or antifeedant. Therefore, the activity of the moderately active EOs (L. angustifolia, M. piperita, M. spicata, R. officinalis, and A. herba-alba) cannot be explained by their main components (linalyl acetate, linalool, menthone, menthol, limonene, camphor, 1,8-cineole, p-cymene, α-pìnene, and carvone), suggesting synergistic effects. p-Cymene was among the most frequent synergists found, interacting with 22 terpenes commonly present in EOs (Pavela et al., 2014). Therefore, synergistic interactions among EO components could explain their ixodicidal effects.

Conclusion

This work has demonstrated the ixodicidal and insect antifeedant effects of EOs from experimentally cultivated AMPs. The EOs grouped as strong ixodicidal agents corresponded to T. zygis, T. vulgaris, S. montana, M. suaveolens, and O. vulgare subsp. virens. Similarly, the EOs grouped as strong antifeedants corresponded to S. montana, T. zygis, and T. vulgaris, followed by O. vulgare subsp. virens and M. suaveolens. The moderate ixodicidal EOs were from L. angustifolia, M. piperita, M. spicata, A. herba-alba, and R. officinalis.

The most effective larvicidal and antifeedant compounds were piperitenone oxide, carvacrol, piperitenone, and thymol, explaining the effects of M. suaveolens, T. zygis, T. vulgaris, S. montana, and O. vulgare subsp. virens EOs. The rest of the tested compounds were not ixodicidal or antifeedant. Therefore, the activity of the moderately active EOs (L. angustifolia, M. piperita, A. herba-alba, R. officinalis, and M. spicata) cannot be explained by their main components (linalyl acetate, linalool, menthone, menthol, limonene, camphor, 1,8-cineole, p-cymene, α-pìnene, and carvone), suggesting synergistic effects.

T. zygis, S. montana, and M. suaveolens were better ixodicidals and S. montana was a better antifeedant than T. vulgaris. Therefore, we propose the plant populations of S. montana, T. zygis, and M. suaveolens tested here for further development as biopesticide ingredients for the control of ticks and insect pests.

Data Availability Statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Author Contributions

AG-C conceptualized the study. AG-C, AO, MG, JN-R, and FV curated the data. MG, FV, and MA did the formal analysis. AG-C, AO, and FV helped with funding acquisition and resources. MG, JN-R, FV, AO, MA, and AG-C did the investigation. AO, FV, AG-C, and MA helped with the methodology. FV and AG-C wrote the original draft. AG-C, AO, MA, FV, and JN-R did the writing—review and editing. All authors have read and agreed to the published version of the manuscript.

Funding

This work has been supported by grants from ERASMUS+ no. 2018-1-FR01-KA202-047892, Biocontrol E Training (BET), and ERASMUS+ 600873-EPP-1-2018-1-ES-EPPKA2. European Hub on New Challenges in the Field of Essential Oils (EOHUB), PID2019-106222RB-C31, MCI, Spain, RTA 2014-00080-00-00, Spain, and the R+D contracts CSIC-Villamagna Estudio Biodirigido de Extractos Ixodicidas and UCM-Villamagna SL Investigación en torno al control de las garrapatas y al estado sanitario de la fauna silvestre.

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.

Acknowledgments

We gratefully acknowledge His Grace the Duke of Westminster and J.M. Tercero (Finca La Garganta, Villamagna) for tick collection and logistic support. We also acknowledge R. Muñoz, V. Morales-Sánchez, E. Moreno (ICA-CSIC), J. Burillo (CITA), María Sánchez (UAX), and Julia Gonzalez (INIA) for technical support.

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Keywords: aromatic plant, essential oil, ixodicidal, antifeedant, Hyalomma lusitanicum, Spodoptera littoralis, Myzus persicae, Rhopaslosiphum padi

Citation: Valcárcel F, Olmeda AS, González MG, Andrés MF, Navarro-Rocha J and González-Coloma A (2021) Acaricidal and Insect Antifeedant Effects of Essential Oils From Selected Aromatic Plants and Their Main Components. Front. Agron. 3:662802. doi: 10.3389/fagro.2021.662802

Received: 01 February 2021; Accepted: 06 April 2021;
Published: 19 May 2021.

Edited by:

Jouda Mediouni-Ben Jemâa, Institut National de la Recherche Agronomique de Tunisie (INRAT), Tunisia

Reviewed by:

Madelaine Venzon, Agronomical Research Institute of Minas Gerais, Brazil
Nik G. Wiman, Oregon State University, United States

Copyright © 2021 Valcárcel, Olmeda, González, Andrés, Navarro-Rocha and González-Coloma. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Azucena González-Coloma, azu@ica.csic.es; A. Sonia Olmeda, angeles@ucm.es

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