Department of Agricultural Sciences

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Author: search.filters.author.Elkahoui Salem

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    Assessment of the efciency of Mentha pulegium essential oil to suppress contamination of stored fruits by Botrytis cinerea
    (Journal of Plant Diseases and Protection- Springer, 2022-08) Aouadi Ghozlene; Kalai Grami Leila; Taibi Faiza; Bouhlal Rym; Elkahoui Salem; Zaagueri Takoua; Jallouli Slim; Chaanbi Manel; Hajlaoui Mohamed Rabeh; Mediouni Ben Jemâa Jouda
    Essential oils are a real ore rich in bioactive compounds characterized by a wide spectrum of various biological activities. In this context, our research focused on the study of the chemical composition of Mentha pulegium and Myrtus communis essential oils growing in Northeast Algeria as well as the exploration of their antifungal activities in vitro and in vivo against Botrytis cinerea responsible for moulding on strawberries. GC–MS analysis indicated that M. pulegium essential oil was an isomenthone chemotype (55.59%) while M. communis essential oil was characterized as a eucalyptol chemotype (36.82%). M. pulegium essential oil expressed the best antifungal activity either with poisonous medium method (MIC=MFC:2.66 µl/ ml) or with volatile activity method (MIC:30 µl) compared to M. communis essential oil, (MIC:5.33 µl/ml, MFC:10.66 µl/ml) which expressed no volatile activity. Both crude oils completely inhibited the germination of B. cinerea spores and resulted in up to 88% morphological changes in conidia. In vivo tests have revealed the efectiveness of M. pulegium essential oil in completely suppressing grey mould from strawberries previously inoculated with conidia of B. cinerea by direct contact or exposure to vapours. M. pulegium essential oil display weak phytotoxicity towards fumigated strawberries at low temperatures (T<16 °C). This low phytotoxicity was confrmed by the preservation of some physical parameters of strawberries stored at 7 °C such as colour and weight loss
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    Screening for insecticidal efficacy of two Algerian essential oils with special concern to their impact on biological parameters of Ephestia kuehniella (Zeller) (Lepidoptera: Pyralidae)
    (Journal of Plant Diseases and Protection-Springer, 2020-08) Aouadi Ghozlene; Haouel Soumaya; Soltani Abir; Ben Abada Maha; Emna Boushih; Elkahoui Salem; Taibi Faiza; Mediouni Ben Jemaa Jouda; Bennadja Salima
    Chemical composition of Algerian Mentha rotundifolia and Myrtus communis essential oils, their insecticidal activities and their impact on some biological parameters of the Mediterranean flour moth Ephestia kuehniella were assessed. Results showed that M. rotundifolia essential oil contained piperitenone oxide (46.06%), D-limonene (9.10%), cis-piperitone oxide (6.81%), and endo-borneol (4.64%) as major compounds, while M. communis oil was rich in α-pinene (29.08%), 1,8-cineole (36.82%), α-terpineol (6.42%), geranyl acetate (4.38%), and β-linalool (4.04%). The fumigant potential and contact toxicity tests against E. kuehniella demonstrated the effectiveness of M. rotundifolia essential oil (LC50 = 0.54 μL/L air, LC50 = 0.004 μL/cm2) compared to M. communis oil (LC50 = 2.91 μL/L air, LC50 = 0.025 μL/cm2). Moreover, results revealed that all biological parameters were significantly affected (fecundity: 6 eggs/female, oviposition deterrence: 96.62%, log fertility: 0, hatching rate: 0%, copulation rate: 0% for M. rotundifolia oil against fecundity: 93 eggs/female, percentage of oviposition deterrence: 47.85%, log fertility: 6.7, hatching rate: 57%, copulation rate: 53.33% for M. communis oil). This work supports the use of botanical insecticide as active pest control agents under storage conditions.
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    Chemical Investigations on Algerian Mentha rotundifolia and Myrtus communis Essential Oils and Assessment of their Insecticidal and Antifungal Activities
    (Friends Science Publishers, 2021) Aouadi Ghozlene; Soltani Abir; Kalai Grami Leila; Ben Abada Maha; Haouel Soumaya; Boushih Emna; Chaanbi Manel; Elkahoui Salem; Hajlaoui Mohamed Rabeh; Mediouni Ben Jemâa Jouda; Taibi Faiza
    This work aimed to assess in vitro insecticidal and antifungal activities of Mentha rotundifolia and Myrtus communis essential oils against the red flour beetle (Tribolium castaneum) and three fungal species (Botrytis cinerea, Fusarium solani and Colletotrichum acutatum). Oxygenated monoterpenes presented the dominant group with 72.94 and 58.92% respectively for M. rotundifolia and M. communis essential oils. M. rotundifolia and M. communis essential oils composition was dominated by 72.94 and 58.92% of oxygenated monoterpenes, respectively. The determined lethal concentrations of mentha essential oils against T. castaneum adults revealed high toxicity respectively for fumigant and contact tests, LC50 = 0.113 μL cm-2 and LC50 = 32.71 μL L-1 air. However, common myrtle oil showed a weak fumigant activity (LC50 = 357.67 μL L-1 air) and no contact toxicity. Furthermore, M. rotundifolia essential oil showed a marked antifungal toxicity against all the fungal strains. The mycelial growth of the three fungal strains was completely inhibited at the concentrations of 0.33 μL L-1 by contact application and 8, 10 and 12 µL by fumigant application. M. communis essential oil displayed only a contact antifungal toxicity against B. cinerea at the concentration 21.33 μL L-1. Additionally, M. rotundifolia completely inhibited conidial germination of B. cinerea and F. solani, and significantly affected their morphology, with morphological modifications at the rate of 92.94 and 51.11% respectively. In light of in vitro tests results, the mentha essential oil appeared to be an excellent source of antifungal and insecticidal components and will allow the potential development of this species in the biological control of several pests and fungal diseases. © 2021 Friends Science Publishers