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Article

Composition of the Essential Oil of Salvia ballotiflora (Lamiaceae) and Its Insecticidal Activity

by
Norma Cecilia Cárdenas-Ortega
1,
Marco Martín González-Chávez
1,
Rodolfo Figueroa-Brito
2,
Antonio Flores-Macías
3,
Diana Romo-Asunción
4,
Diana Elizabeth Martínez-González
4,
Víctor Pérez-Moreno
5 and
Miguel Angel Ramos-López
5,*
1
Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, Zona Universitaria, C.P. 78290 San Luis Potosí, S.L.P., Mexico
2
Centro de Desarrollo de Productos Bióticos, Instituto Politécnico Nacional, Carretera Yautepec-Jojutla, km 6, Calle Ceprobi No. 6, Col. San Isidro, C.P. 62731 Yautepec, Morelos, Mexico
3
Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana Unidad Xochimilco, Calzada del Hueso 1100, Col. Villa Quietud, C.P. 04960 Deleg. Coyoacán, D.F., Mexico
4
Estudiante de la Maestría en Ciencias Agropecuarias, Universidad Autónoma Metropolitana Unidad Xochimilco, Calzada del Hueso 1100, Col. Villa Quietud, C.P. 04960 Deleg. Coyoacán, D.F., Mexico
5
Facultad de Química, Universidad Autónoma de Querétaro, Cerro de las Campanas s/n, Col. Las Campanas, C.P. 76010 Santiago de Querétaro, Querétaro, Mexico
*
Author to whom correspondence should be addressed.
Molecules 2015, 20(5), 8048-8059; https://doi.org/10.3390/molecules20058048
Submission received: 30 March 2015 / Revised: 28 April 2015 / Accepted: 28 April 2015 / Published: 5 May 2015
(This article belongs to the Collection Bioactive Compounds)

Abstract

:
Essential oils can be used as an alternative to using synthetic insecticides for pest management. Therefore, the insectistatic and insecticidal activities of the essential oil of aerial parts of Salvia ballotiflora (Lamiaceae) were tested against the fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae). The results demonstrated insecticidal and insectistatical activities against this insect pest with concentrations at 80 µg·mL−1 resulting in 20% larval viability and 10% pupal viability. The larval viability fifty (LV50) corresponded to a concentration of 128.8 µg·mL−1. This oil also increased the duration of the larval phase by 5.5 days and reduced the pupal weight by 29.2% withrespect to the control. The GC-MS analysis of the essential oil of S. ballotiflora showed its main components to be caryophyllene oxide (15.97%), and β-caryophyllene (12.74%), which showed insecticidal and insectistatical activities against S. frugiperda. The insecticidal activity of β-caryophyllene began at 80 µg·mL−1, giving a larval viability of 25% and viability pupal of 20%. The insectistatic activity also started at 80 µg·mL−1 reducing the pupal weight by 22.1% with respect to control. Caryophyllene oxide showed insecticidal activity at 80 µg·mL−1 giving a larval viability of 35% and viability pupal of 20%.The insectistatic activity started at 400 µg·mL−1 and increased the larval phase by 8.8% days with respect to control. The LV50 values for these compounds were 153.1 and 146.5 µg·mL−1, respectively.

1. Introduction

The caterpillar of Spodoptera frugiperda (Lepidoptera: Noctuidae) is a significant polyphagous insect pest of agricultural importance, not only for the damage it causes, but also due to its control difficulties [1]. This species inhabits the American continent from southern Canada to Argentina and causes considerable economic losses in several important crops such as maize, sorghum, rice, cotton, alfalfa, forage grasses, and occasionally other crops in the majority of the countries within its range [2,3,4]. The principal method to control this insect is the application of synthetic insecticides which yield effective results over a short time period, however, resistance development to these insecticides is also very fast, leading farmers to increase dosages or change the active ingredient frequently [5,6,7].
The implementation of Integrated Pest Management Programs appear to be a suitable alternative to managing noctuid insects by combining different methods that include the use of botanical extracts as insecticides [8]. Due to this, there has been a growing interest in botanical resources with activity against insect pests. This need has originated from the demand to provide alternatives to reduce the use of synthetic insecticides, which can have adverse effects on the environment [9]. The use of essential oils against insect pests has been frequently proposed. According Koul et al. [10] these substances are defined as any volatile oil(s) that have strong aromatic components and that give a distinctive odor, flavor or scent to a plant. These oils can be found in glandular hairs or secretory cavities of plant-cell walls and are present as droplets of fluid in the leaves, stems, bark, flowers, roots, and/or fruits of different plants. The essential oils provide various functions for the plants including: (i) attracting or repelling insects; (ii) protecting them from heat or cold; and (iii) utilizing chemical constituents in the oil as means of defense. Many plant essential oils obtained from Salvia species and their constituent compounds have been evaluated against insect pests and a number of them have shown considerable promise for the development of natural repellents/insecticides [11,12,13,14]. The Salvia genus is the most diverse of Lamiaceae Family, with over 1000 species around the world distributed in tropical and subtropical zones. In Mexico, there are at least 300 species reported [15]. This genus demonstrates an affinity to pine and oak forests as well as cloud and tropical deciduous forest, but also has shown remarkable diversity and endemism in arid and desert zones. The Mexican states richest in these species are: Oaxaca, Guerrero, Puebla, Jalisco, Michoacán, Coahuila, Baja California Sur, Tamaulipas and San Luis Potosí [16].
Therefore, the aim of this study was to determine insecticidal and insectistatic activities against S. frugiperda of the essential oil of the aerial parts of Salvia ballotiflora (Lamiaceae) and its main components.

2. Results and Discussion

The GC-MS analysis of the aerial parts S. ballotiflora essential oil, showed 37 different compounds (Table 1), corresponding to 67% of the total composition. The main components were sesquiterpenes such as β-caryophyllene (C15 H24) with 12.74% and caryophyllene oxide (C15 H24 O) with 15.97% (Figure 1). In other essential oils of Salvia species, the main components were similar, with Salvia verticillata containing 16.03% and 15.24% of β-caryophyllene and caryophyllene oxide, respectively [17]; for Salvia hydrangeathe composition was 25.1% and 11.5% [18]. In another study of the essential oils from S. verticillata, Salvia sclarea, Salvia chloroleuca, and Salvia multicaulis, β-caryophyllene was the principal compound in each of the species with 31.5%, 9%, 9% and 8.9%, respectively [19]. Essential oil of Salvia aethiopi and Salvia nemorosa also contained high concentrations of β-caryophyllene (24.8% and 19.03% for each plant) [17]. In the essential oil from Salvia verbenaca, caryophyllene oxide was the main component with 7.28% [20]. According Liu et al. For Salvia umbratica, had a caryophyllene oxide concentration of 8.42% [12]. On the other hand, Lima et al. [21] found (E)-caryophyllene (15.35%), α-eudesmol (14.06%), β-eudesmol (8.74%) and γ-eudesmol (7.64%) as a principal components of essential oil of aerial parts of Salvia microphylla.
Figure 1. Structures of β-caryophyllene (a) and caryophyllene oxide (b).
Figure 1. Structures of β-caryophyllene (a) and caryophyllene oxide (b).
Molecules 20 08048 g001
Table 1. S. ballotiflora Essential Oil Chemical Composition.
Table 1. S. ballotiflora Essential Oil Chemical Composition.
No.RTComponentKILKI*Peak Area%
19.08(−)-β-Pinene961.79500.49
210.153-Octanol9859950.61
311.51Eucalyptol102310271.16
412.42β-cis-Ocimene102410460.44
514.8Linalol108110960.9
615.31exo-Fenchol111211070.12
715.67Isophorone109411150.3
816.67(−)-Alcanfor114611370.16
917.71Camphol114811590.46
1018.28Terpinen-4-ol116111710.42
1118.94α-Terpineol117211860.95
1219.77exo-2-Hydroxycineole121212040.55
1323.28Bornylacetate126912820.47
1425.54δ-EIemene133413330.43
1526.52Eugenol133713550.66
1626.96Ylangene139213650.14
1727.81β-Cubebene138413840.17
1827.9β-Elemene138713860.44
1929.04β-Caryophyllene1424141312.74
2029.75α-Bergamotene140714310.51
2130.41Humulene145614473.87
2230.79(+)-epi-Bicyclosesquiphellandrene143514560.22
2331.41γ-Muurolene149414721.62
2431.73α-Curcumene147214800.56
2532.13Eremophilene148614900.84
2632.37α-Muurolene149014960.66
2732.91γ-Cadinene150515091.21
2833.32δ-Cadinene151415193.98
2934.04α-Calacorene153915370.16
3035.01Nerolidol154515611.3
3135.65Caryophylene oxide1576157715.97
3235.92α-Acorenol159815840.93
3336.59Longifolenaldehyde158116012.24
3436.742-Methylene-6,8,8-trimethyltricyclo [5.2.2.0 (1,6)] undecan-3-ol159916051.07
3537.87τ-Cadinol162816362.35
3638.34α-Cadinol164116493.27
3751.74Abietatriene203920620.11
Retention time (in minutes). KI Kovats index, relative to C6-C26 n-alkanes on the HP-5MS column. KIL Kovats index on an apolar column; * Values reported as a percentage of the total area.
The insecticidal activity of S. ballotiflora essential oil at 1000, 600, 400, 120 and 80 µg·mL−1 showed larval viability of 0%, 5%, 10%, 10% and 20%, respectively. The pupal viability at 600, 400, 120 and 80 µg·mL−1 was 5%, 10%, 10% and 20%, respectively. The LV50 was 128.8 µg·mL−1 (Table 2). The insectistatic activity increased the larval duration by 30.5, 8.0, 5.5, and 5.5 days at 600, 400, 120, 80 µg·mL−1 with respect to the control. Regarding the pupal duration there was an increase of 1.6 days at 400 µg·mL−1. Moreover the pupal weight was reduced by 52%, 39%, 29%, 29% at 600, 400, 120, 80 µg·mL−1, respectively, when compared to the control pupal weight. On the other hand, Hosseini et al. [22] showed that the CL50 of essential oil of Salvia leriifolia against adults of Sitophilus granarius (Coleoptera: Curculionidae) and Rhyzopertha dominica (Coleoptera: Bostrichidae), after 24 h were 79.17 μL·L−1 and 25.87 μL·L−1 respectively. Moreover, Khiyari et al. [23] also reported the insecticidal activity of two essential oils of Salvia aucheri, one from a wild plant and another from a cultivated plant against adults of Tribolium castaneum (Coleoptera: Tenebrionidae); the authors determined the CL50 and CL90 for each, and the wild plant the values were 1.00 μL·cm−2, 1.72 μL·cm−2, respectively, and for the cultivated plant the values were 1.25 μL·cm−2 and 2.03 μL·cm−2. Ulukanli et al. [14] evaluated the activity of essential oil of Salvia tomentosa against adults of Acanthoscelides obtectus (Coleoptera: Bruchidae) and T. castaneum; this oil caused 100% mortality at 50 µL·L−1 air and 200 µL·L−1 air for each insect. Liu et al. [12]. They also reported a LD50 of 18.12 µg·adult−1 of the essential oil of S. umbratica against Sitophilus zeamais (Coleoptera: Curculionidae). The essential oils from Salvia hydrangea, Salvia numerosa, Salvia multicaulis and Salvia sclarea (Lamiaceae) were also tested against adults of S. granarius. These essential oils caused 67.33%, 39.73%, 55.21% and 41.76% mortality at 153.84 µL·L−1 air concentration [24]. On the other hand, the essential oils of Salvia limbata and Salvia nemorosa (Lamiaceae) resulted in average mortality rates against S. granarius (10% and 14%, respectively) at 76.91 µL·L−1 air concentration. The mortality rate increased with the concentration of the essential oils and the length of the exposure period [25].
Table 2. Insecticide and insectistatic activities of S. ballotiflora essential oil against S. frugiperda.
Table 2. Insecticide and insectistatic activities of S. ballotiflora essential oil against S. frugiperda.
Concentration (µg·mL−1)Viability (%)Duration (d)Pupal Weight (mg)
LarvaPupaLarvaPupa
1000-----
6005.0 ± ND *-57.0 ± ND *-106.0 ± ND *
40010 ± 6.8 *5.0 ± ND *34.5 ± 2.5 *12.0 ± ND *133.5 ± 9.5 *
16010 ± 6.8 *10 ± 6.8 *32.0 ± 1.0 *11.0 ± 1.0155.5 ± 9.5 *
8020 ± 9.2 *10 ± 6.8 *32.0 ±2.8 *10.5 ± 0.5156.5 ± 3.9 *
095 ± 5.090 ± 6.826.5 ± 0.510.2 ± 0.4221.1 ± 9.1
LV500.1288 × 103 (0.0835–0.1590) µg·mL−1
Results are the mean of at least 20 determinations ± standard error. * Significantly different from control p < 0.05. LV50 was calculated using larval viability, in parentheses confidence intervals p < 0.05.
Others studies have reported insectistatic activity with some Salvia species, Karahroodi et al. [26] showed 56% and 32% repellency with the essential oils of Salvia multicaulis and Salvia officinalis (Lamiaceae), respectively, against female adults of Plodia interpunctella (Lepidoptera: Pyralidae) at 15.39 µL·L−1 air concentration using an olfactometer. Additionally, Lakshmanan et al. [27] reported antifeedant activity rates of 85.56% on Spodoptera litura (Lepidoptera: Noctuidae), 45.64% on Helicoverpa armigera (Lepidoptera: Noctuidae) and 79.45% on Achaea janata (Lepidoptera: Noctuidae) with 1000 µg·mL−1 of S. officinalis essential oil. Conti et al. [28] described 100% repellency activity within the first 15 minutes at 0.04, 0.2 and 0.4 μL·cm−2 with the essential oils from Salvia dorisiana, Salvia longifolia, Salvia sclarea against adults of Aedes albopictus (Diptera: Culicidae), and the repellency was 90% after 90 minutes of exposure with 0.4 μL·cm−2 from S. dorisiana.
Specifically, chloroform extracts from the aerial parts of four Salvia species (Lamiaceae) were tested for insectistatic and insecticidal activities against S. frugiperda. All extracts showed both activities. Extracts from Salvia keerlii, and Salvia ballotiflora, had moderate insecticidal activity (LV50 1527 and 1685 µg·mL−1, respectively), and the S. ballotiflora extract increased the larval and pupal phases by 5.2 and 2.9 days, respectively, and reduced the pupal weight by 13.2% [29]. In this study, essential oil from aerial parts of S. ballotiflora had high insecticidal activity (larval viability of 0%, 5%, 10%, 10% and 20%, a 1000, 600, 400, 120 and 80 µg·mL−1, respectively). The insectistatic activity increased the larval duration by 30.5, 8.0, 5.5, and 5.5 days, and reduced the pupal weight by 29% a 52% at 600, 400, 120, 80 µg·mL−1 respectively in regards to the control.
The insecticide activity of β-caryophyllene at 1000, 600, 400, 160 and 80 µg·mL−1 showed larval viability of 5%, 20%, 20%, 25% and 25% respectively and the pupal viability was 0%, 5%, 5%, 20% and 20% respectively. The LV50 was 153.1 µg·mL−1 (Table 3). The insectistatic activity caused the larval duration increases of 24.8, 11.8, 9.8, and 5.8 days at 1000, 600, 400 and 160 µg·mL−1 with respect to the control, and at all concentrations there was no adult emergence, therefore is no data for pupal duration. Moreover, the pupal weight was reduced by 52%, 39%, 29%, 29% at 600, 400, 160, 80 µg·mL−1 respectively in regards to the control pupal weight. The insecticidal activity of caryophyllene oxide at 1000, 600, 400, 160 and 80 µg·mL−1 showed larval viability of 0%, 5%, 5%, 20% and 35%, respectively, and the pupal viability at same concentrations was 0%, 5%, 5%, 20% and 20%, respectively. The LV50 was 146.5 µg·mL−1 (Table 4). The insectistatic activity began to increase the larval duration by 9.8, and 8.8 days at 600 and 400 µg·mL−1 with respect to the control and at all concentrations there was no adult emergence, therefore there is no data for pupal duration. Moreover the pupal weight was reduced by 16.7% at 600 µg·mL−1 in respect to the control pupal weight.
Table 3. Insecticide and insectistatic activities of β-caryophyllene against S. frugiperda.
Table 3. Insecticide and insectistatic activities of β-caryophyllene against S. frugiperda.
Concentration (µg·mL−1)Viability (%)Duration (d)Pupal Weight (mg)
LarvaPupaLarvaPupa
10005.0 ± 5.0 *-50.0 ± ND *-116 ± ND *
60020.0 ± 9.2 *5.0 ± 5.0 *37.0 ± ND *-109.2 ± 34.6 *
40020.0 ± 9.2 *5.0 ± 5.0 *35.0 ± ND *-147 ± 49.0 *
16025.0 ± 9.9 *20.0 ± 9.2 *31.0 ± 1.0 *-155.5 ± 9.5 *
8025.0 ± 9.9 *20.0 ± 9.2 *27.6 ± 2.2-163.7 ± 16.7 *
095.0 ± 5.090.0 ± 6.925.2 ± 1.49.2 ± 0.8210.1 ± 14.0
LV500.1531 × 103 (0.1045–0.1842) µg·mL−1
Results are the mean of at least 20 determinations ± standard error. * Significantly different from control p < 0.05. LV50 was calculated using larval viability, in parentheses confidence intervals p < 0.05.
Liu et al. [30], reported the insecticidal activity and fumigant toxicity of caryophyllene oxide on two insect pests. These results demonstrated a LD50 of 34.09 mg·adult−1 and LC50 of 17.02 mg·L−1 against S. zeamais, and a LD50 of 45.56 mg·adult−1 and LC50 of 15.98 mg·L−1 against T. castaneum. This sesquiterpene was reported as one of the main components (9.32%) of the essential oil of fruits of Illicium pachyphyllum (Schisandraceae). The essential oil of the aerial parts of Saussurea nivea (Asteraceae) used as a fumigant LC50 of 8.89 mg·L−1 and contact LC50 of 10.56 µg·adult−1 against S. zeamais. The main components of this oil were (+)-limonene (15.46%), caryophyllene oxide (7.62%), linalool (7.20%), α-pinene (6.43%), β-pinene (5.66%) and spathulenol (5.02%) [31]. Tchoumbougnang et al. [32], showed that essential oils of fruits of Piper capense (LD50 26.4 µL·g−1), Piper guineese (LD50 16.1 µL·g−1) and Piper nigrum (LD50 10 µL·g−1) had insecticidal activity against S. zeamais, and that in those oils β-caryophyllene was a compound with 3.4%, 20.8% and 12.8% in each of the species.
Table 4. Insecticide and insectistatic activities of Caryophyllene oxide against S. frugiperda.
Table 4. Insecticide and insectistatic activities of Caryophyllene oxide against S. frugiperda.
Concentration (µg·mL−1)Viability (%)Duration (d)Pupal Weight (mg)
LarvaPupaLarvaPupa
1000-----
6005.0 ± 5.0 *5.0 ± 5.0 *35.0 ± ND *-175.0 ± ND *
4005.0 ± 5.0 *5.0 ± 5.0 *34.0 ± ND *-195.0 ± 9.5
16020.0 ± 9.2 *20.0 ± 9.2 *28.3 ± 1.5-200.8 ± 8.9
8035.0 ± 3.7 *20.0 ± 9.2 *26.3 ± 1.9-201.3 ± 9.1
095.0 ± 5.090.0 ± 6.8825.2 ± 1.49.2 ± 0.8210.1 ± 14.0
LV500.1465 × 103 (0.1036–0.1742) µg·mL−1
Results are the mean of at least 20 determinations ± standard error. * Significantly different from control p < 0.05. LV50 was calculated using larval viability, in parentheses confidence intervals p < 0.05.
Chaubey [33], evaluated the essential oil of Zingiber officinale (Zingiberaceae) and Piper cubeba (Piperaceae) and the main compounds of those oils, that worked against adults and larvae of Tribolium castaneum (Coleoptera: Tenebrionidae) and adults of Sitophilus oryzae (Coleoptera: Curculionidae) were β-caryophyllene and α-pinene. β-caryophyllene showed LD50 values of 0.173 µL cm−2 after 24 h against T. castaneum adults, 0.17 µL cm−2 after 24 h against T. castaneum larvae, and 0.159 µL cm−2 after 24 h against S. oryzae adults. Benelli et al. [34] tested the essential oil of Hyptis suaveolens (Lamiaceae) and its principal compounds against Sitophilus granarius (Coleoptera: Curculionidae), β-caryophyllene (11.2%) showed 65% of repellence activity.

3. Experimental Section

3.1. Plant Material

The aerial parts (leaves, stems and flowers) of S. ballotiflora were collected in the Municipio of Guadalcázar, San Luis Potosí, México, at 1640 m.a.l.s., in September of 2013, the Taxonomic authentication was performed by José García-Pérez at the Isidro Palacios Herbarium of the Universidad Autónoma de San Luis Potosí. A voucher specimen was stored (SLPM 43013).

3.2. Essential Oil Extraction

Aerial parts of the plant weighing approximately 2 kg, were submitted to hydrodistillation for 3 hours. The mixture obtained was treated with ethyl ether, then the organic phase was separated and concentrated with a rotatory evaporator at 18 °C. The essential oil obtained was dehydrated with anhydrous sodium sulphate, and the ethyl ether residue was eliminated under vacuum, to give a yellow amber essential oil with a density of 0.6836 g·mL−1 at 20 °C, and refraction index of 1.4095 at 25 °C. The yield was (0.47 w/w). The oil was protected from direct light and stored at 4 °C until its use.

3.3. Chemicals

β-caryophyllene and caryophyllene oxide standards were purchased from Sigma-Aldrich (St. Louis, MO, USA).

3.4. Identification of Essential Oil Main Components

S. ballotiflora essential oil samples (20 µL) were diluted with acetone (1 mL). The essential oil was analyzed on an Agilent Technologies (Santa Clara, CA, USA) 6890N GC equipped with an HP-5MS column (30 m in length; 25 mm internal diameter; 0.25 μm film thicknesses) and an Agilent EM 5973 detector, at 250 °C. The carrier gas was helium, with a flow rate of 1 mL·min−1; the split ratio was 2:1. The column temperature was initially 50 °C (for 3 min) and was gradually increased to 240 °C, at 3 °C·min−1; this temperature was held for 2 min. The injector temperature was 250 °C and 1 μL of essential oil was injected as a duplicate. The spectra were collected at 71 eV ionization voltages and the analyzed mass range was 15–600 m/z. The identification of the components were confirmed by comparison of the retention indices with those of authentic compounds using the Kovats index, based on n-alcanes C6-C26 with the Wiley09/NIST11 library. The identification of the two main components was confirmed by comparison of the retention indices to those of authentic compounds.

3.5. Insect Rearing

Fall armyworm (S. frugiperda) larvae were reared in the Insecticide Natural Compounds Laboratory from the Chemistry Faculty of the Autonomous University of Querétaro, according to the Bergvinson and Kumar [35] methodology using the following parameters: temperature 25 ± 2 °C with a relative humidity of 70% and 12/12 h light/dark cycles. For 1 kg diet feed for S. frugiperda, the following ingredients were used: 800 mL of distilled water, 60 g diet (Product# F0635 S.W. Corn Borer, Bio-Serv, Frenchtown, NJ, USA), 20 g sterile corn spike, 100 g ground corn, 40 g brewer’s yeast, 10 g vitamins (vitamin mix fortification lepidoptera, Bio-Serv), 10 g agar, 1.7 g sorbic acid (dissolved in the ethanol), 17 mL ethanol, 2.5 mL formaldehyde, 1.7 g methyl p-hydroxybenzoate and 0.6 g neomycin sulfate.

3.6. Bioassay

For the bioassay, first instar larvae of S. frugiperda were used. Groups of 20 larvae were randomly selected for each concentration of S. ballotiflora essential oil, β-caryophyllene and caryophyllene oxide. Preliminary screening of essential oil for each compound was carried out at five concentrations (0.1, 1, 10, 100 and 1000 µg·mL−1). Based on the preliminary screening results, the concentration-dependent levels were selected (80, 160, 400, 600 and 1000 µg·mL−1). The test included a negative control (diet only). The essential oil, β-caryophyllene and caryophyllene oxide were mixed with the larvae diet ingredients during preparation without use of any solvent, according the methodology of Ramos-López et al. [36]. The effect of essential oil and the compounds were monitored during all larval stages “known as the larval-phase duration”, and the pupal stage “called the pupal-phase duration”. The number of pupae formed (larval viability), number of adults formed (pupal viability), and weight of pupae at 24 hours were assessed. The larval viability (LV50) corresponded to 50% of the larvae of fall armyworm during all larval phases for each extract.

3.7. Statistical Analysis

Statistical analysis was conducted and data was assessed for normality and homoscedasticity prior to analysis. In some cases Kruskal-Wallis non-parametric analysis of variance was used when data violated these assumptions and could not be corrected using a transformation. ANOVA analysis and Tukey test were also performed, and the LV50 were calculated by Probit analysis, using the SYSTAT statistical analysis program [37].

4. Conclusions

The essential oil of aerial parts of S. ballotiflora had insectistatic and insecticidal activities against S. frugiperda. β-caryophyllene and caryophyllene oxide were the main components of S. ballotiflora essential oil and these compounds also showed insectistatic and insecticide activities against the fall armyworm.

Acknowledgments

The authors gratefully acknowledge at the Autonomous University of Querétaro for the Institutional Program for Research FOFI-UAQ (FCQ201408), M. in S. Mercy Lea Dinwiddie for English edition. Q. Edgar Javier Turrubiartes Hernández and Tec. María Estela Nuñez Pastrana for their technical support.

Author Contributions

Ramos-López M.A. conceived and designed the study; Cardenas-Ortega N.C. and González-Chávez M.M., provide plant essential oil and identified its composition; Romo-Asunción D. and Martínez-González D.E., performed in vitro activity studies; Figueroa-Brito R., provide insect rearing and interpreted the results; Ramos-López M.A., Flores-Macías A. analyzed the results; Ramos-López M.A. and Pérez-Moreno V., wrote the paper. All authors read and approved the manuscript.

Conflicts of Interest

The authors declare no conflicts of interest, financial or otherwise.

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MDPI and ACS Style

Cárdenas-Ortega, N.C.; González-Chávez, M.M.; Figueroa-Brito, R.; Flores-Macías, A.; Romo-Asunción, D.; Martínez-González, D.E.; Pérez-Moreno, V.; Ramos-López, M.A. Composition of the Essential Oil of Salvia ballotiflora (Lamiaceae) and Its Insecticidal Activity. Molecules 2015, 20, 8048-8059. https://doi.org/10.3390/molecules20058048

AMA Style

Cárdenas-Ortega NC, González-Chávez MM, Figueroa-Brito R, Flores-Macías A, Romo-Asunción D, Martínez-González DE, Pérez-Moreno V, Ramos-López MA. Composition of the Essential Oil of Salvia ballotiflora (Lamiaceae) and Its Insecticidal Activity. Molecules. 2015; 20(5):8048-8059. https://doi.org/10.3390/molecules20058048

Chicago/Turabian Style

Cárdenas-Ortega, Norma Cecilia, Marco Martín González-Chávez, Rodolfo Figueroa-Brito, Antonio Flores-Macías, Diana Romo-Asunción, Diana Elizabeth Martínez-González, Víctor Pérez-Moreno, and Miguel Angel Ramos-López. 2015. "Composition of the Essential Oil of Salvia ballotiflora (Lamiaceae) and Its Insecticidal Activity" Molecules 20, no. 5: 8048-8059. https://doi.org/10.3390/molecules20058048

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