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Dr. Amira Mohamed El-sayed El-shiwy :: Publications:

Evaluation of Essential Oil and its Main Active Ingredients of Chinese Litsea cubeba Against Two Stored-Grain Insects
Authors: K.K.H. Elgizawy, A.M. El-Shewy and Amany R. Morsy
Year: 2019
Keywords: Essential oil Litsea cubeba Contact Fumigation Toxicity Repellency and Stored product insects
Journal: Academic Journal of Entomology
Volume: 12
Issue: 2
Pages: 29-39
Publisher: Not Available
Local/International: International
Paper Link: Not Available
Full paper Amira Mohamed El-sayed El-shiwy_amira 3.pdf
Supplementary materials Not Available

Essential oils obtained from different plants showed several types of pesticide properties; some of them may be considered alternatives to insecticides for pest control. The main purpose of this research was to detect the chemical composition of the essential oil derived from the fruits of Litsea cubeba (Lauraceae). In addition, to evaluate the contact and fumigant toxicity and repellent activities of the essential oil and two main active ingredients against the adults of two stored grain insect pests; riceweevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae) and the red flour beetle, Tribolium castaneum (Herbst.) (Coleoptera: Tenebrionidae) in the laboratory. Twenty-one components were identified in the essential oil with gas chromatography-mass spectrometry (GC-MS). The main constituents included E-citral (geranial) (28.49%), Z-citral (neral) (21.57%) and D-limonene (18.82%) followed by Citronella (3.20%), -pinene (2.85%), Terpinol-4-ol (2.46%), -Thujene (2.34%) and Geraniol (2.25%). Citral (Z/E-citral) and D-limonene separated as main components from the essential oil. Results from the three compounds; the essential oil, citral and D-limonene showed strong contact toxicity against S. oryzae with LD 7.51, 7.75 and 29.57 µg/l, while fumigation had higher toxicity on the same insects 50 4.44, 4.89 and 16.68 µg/l, respectively. In the case of the adults of T. castaneum, those were more resistant to the essential oils and its main active compounds. The contact toxicity of essential oils, citral and D-limonene against T. castaneum presented LD values 253.66, 349.47 and 3803.20 µg/l, while the fumigation toxicity 50 recorded 204.34, 296.64 and 592.08 µg/l, respectively. Otherwise, the essential oils, citral and D-limonene were strong repellents against S. oryzae at 60 nL cm , being 81.83 and 53.30%, respectively after two and four hours 2 post-treatment. Whereas, the repellency percentages for T. castaneum were 85.76 and 82.33%, respectively, at the same conditions mentioned before. At the same concentrations, the essential oil had more repellent effect on T. castaneum than S. oryzae. Thus, the essential oils of L. cubeba might be potential to be developed as a natural contact and fumigant insecticides or repellents for control of the two insect species under study.

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