Chemical composition and insecticidal potential of essential oils from Egyptian plants against Sitophilus oryzae (L.) (Coleoptera: Curculionidae) and Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae)

Abstract

Essential oils of eight plants growing in Egypt were isolated by hydrodistillation. The chemical composition of the isolated oils was examined by gas chromatography/mass spectrometry (GC-MS). In the contact toxicity assay, the oils of Mentha microphylla and Artemisia judaica were the most potent against Sitophilus oryzae. When tested against Tribolium castaneum, the oils of M. microphylla, Eucalyptus camaldulensis and A. judaica showed the highest activity among the test oils with M. microphylla being the most potent. In the fumigant assay, the oil of M. microphylla displayed the strongest insecticidal activity against S. oryzae (LC 50 ϭ0.21 ml/L), while the oils of Lantana camara (LC 50 ϭ29.47 ml/L) and E. camaldulensis (LC 50 ϭ30.81 ml/L) revealed good activity. In the case of T. castaneum, the oil of M. microphylla (LC 50 ϭ4.51 ml/L) was the most effective, followed by Citrus reticulata (LC 50 ϭ19.47 ml/L) and Schinus terebenthifolius (LC 50 ϭ20.50 ml/L). The most interesting finding in this study is the potent contact and fumigant toxicity of M. microphylla oil against S. oryzae and T. castaneum. These results suggested that M. microphylla oil could be used as a potential control agent for S. oryzae and T. castaneum.

Chemical Composition and Inhibitory Effects of Essential Oils on Germination and Seedling Growth of Barnyard Grass, Echinochloa crusgalli L.

“…On the other hand, the major constituents of the essential oils isolated from A. monosperma, O. vulgare, T. occidentalis and A. judaica were completely differed with those previously reported on the chemistry of these oils (Şahin et al, 2004;Mohamed and Abdelgaleil, 2008;Tsiri et al, 2009;Khan et al, 2012). Some of the major constituents of the essential oils of P. tortuosus, V. agnus-castus, S. terebinthifolius and S. cumini were similar to those previously reported for the oils isolated from plants growing in Egypt and other countries around the world (Singab et al, 2003;Gundidza et al, 2009;Stojković et al, 2011).…”

Genus Lantana: chemical aspects and biological activities

“…The results showed that both species have larvicidal potential: L. camara with LC50 of 42.3±0.85 µg/mL, and L. montevidensis with LC50 of 117±0.5 µg/mL. The essential oil also showed insecticidal activity against adults of Sitophilus oryzae L. (LC50 0.22 mg/cm 2 ) and Tribolium castaneum (LC50 0.22 mg/cm2), and revealed low fumigant toxicity against S. oryzae (LC50 29.47 µL/L) and against T. castaneum (LC50 47.68 µL/L) (Mohamed & Abdelgaleil, 2008). Kumar & Maneemegalai (2008) investigated the methanol and ethanol extracts of leaves and flowers of L. camara L. and showed mosquito larvicidal activity against 3 rd and 4 th instar larvae of the mosquito species A. aegypti and C. quinquefasciatus.…”

Entomocidal activity of microwave energy & some aqueous plant extracts against Tribolium castaneum Herbst & Trogoderma granarium Everts

“…The highest insecticidal activity of Mentha microphylla might refer to the chemical ingredients of the leaves (i.e. menthone and piperitone) which are physiologically active chemicals and have been used in insecticide manufacturing [39]. Besides, piperitone oxide possess antibacterial and antifungal activity [40].…”

“…The botanical extracts exhibited more insecticidal toxicity against T. castaneum than to C. maculates and S. zeamais [42]. [43] observed during laboratory experiment that highest insecticidal activity recorded via Mentha microphyla oil extract on Tribolium castaneum and Sitophilus oryzae, followed by Eucalyptus camaldulensis within eight different plant extracts. Wherease in another study, Mentha microphyla showed similar toxicity to both T. castaneum and S. oryzae [39].…”