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RISS 인기검색어
- 검색키워드
- 저자 : Hamdy K. Abou-Taleb (검색결과 2 건)
- 무료
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Adulticidal, larvicidal and biochemical properties of essential oils against Culex pipiens L
Hossam El-Din M. Zahran,Hamdy K. Abou-Taleb,Samir A.M. Abdelgaleil 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.1
In this study, the insecticidal properties of sixteen essential oils isolated from Egyptian plants were evaluated against the fourth instar larvae and adults of Culex pipiens L. The inhibitory effects of most active essential oils on the activity of acetylcholinesterase (AChE) and adenosine triphosphatases (ATPases) were also tested. In larvicidal assay against Cx. pipiens, the oils of Artemisiamonosperma, S. terebinthifolius and Origanumvulgare showed the highest insecticidal activity with LC50 values of 7.73, 8.14 and 8.40 mg/l after 24 h of treatment and 2.63, 3.46 and 6.74mg/l after 48 h of treatment.On the contrary, the oils of Schinusmolle and Rosmarinus officinalis were the less effective. The results of fumigant toxicity assay against the adults of Cx. pipiens revealed that the tested oils had remarkable toxicity based on their LC50 valueswhich ranged between 0.06 and 12.84 mg/l. The oil of Artemisia judaicawas the most activewith an estimated LC50 value of 0.06mg/l air after 24 h of treatment, while the oil of Citrus paradisi was less active. The essential oils of A. monosperma, O. vulgare, S. terebinthifolius and C. paradisi elicitedmarked enzymatic inhibition towards AChE and ATPases isolated fromCx. pipiens larvae. These results indicated that the essential oils have potential for the development of natural larvicides and fumigants for Cx. pipiens control.
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Nagwa M.A. Al-Nagar,Hamdy K. Abou-Taleb,Mohamed S. Shawir,Samir A.M. Abdelgaleil 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.1
Eleven monoterpenes, phenylpropenes and sesquiterpenes were evaluated for their insecticidal and growth inhibitory activities against the second and fourth larval instars of Spodoptera littoralis. Among the tested compounds, 1,8-cineole revealed the highest fumigant toxicity against the 2nd and 4th larval instars with LC 50 values of 2.32 and 3.13 mg/L air, respectively. The monoterpenes, p-cymene, α-terpinene, (−)α-pinene and (−)-carvone were highly toxic to both larval stages as their LC 50 values ranged between 7.35 and 13.79 mg/L air against 2nd larval instar and between 14.66 and 32.02 mg/L air against 4th larval instar. In topical application assay against the 4th larval instar, (−)-carvone (LD 50 = 0.15 mg/larva) and cuminaldehyde (LD 50 = 0.27 mg/larva) were the most potent contact toxicants. In residual film assay, trans-cinnamaldehyde, (−)-citronellal and pcymene showed the highest insecticidal activity against the 2nd larval instar, while α-terpinene and (−)-carvone were most effective compounds against the 4th larval instar. Moreover, the tested compounds caused strong growth reduction of both larval stages with growth inhibition higher than 80% in the 2nd larval instar and higher than 70% in the 4th larval instar. On the other hand, (−)-carvone, cuminaldehyde and (Z,E)-nerolidol showed pronounced inhibitory effects on acetylcholinesterase (AChE) and adenosine triphosphatases (ATPases) activity of S. littoralis larvae. Cuminaldehyde (IC 50 = 1.04 mM) and (Z,E)-nerolidol (IC 50 = 0.02 mM) caused the highest inhibition of AChE and ATPases, respectively. Taken together, the results indicate that monoterpenes, phenylpropenes and phenylpropenes could be used to develop new botanical insecticides for S. littoralis management.
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