Fumigant and contact toxicity of Allium sativum (Alliaceae) essential oil against Sitophilus oryzae L. (Coleoptera: Dryophthoridae)

M. K. Chaubey


In this study, Allium sativum (Alliaceae) essential oil was extracted and evaluated for repellent, insecticidal, feeding inhibitory, oviposition inhibitory and acetylcholinesterase enzyme inhibitory activities against rice weevil, Sitophilus oryzae. In the repellency assay, A. sativum oil repelled S. oryzae adults significantly at 0.2% concentration. A. sativum oil caused fumigant and contact toxicity in S. oryzae adults. In fumigation toxicity assay, median lethal concentrations (LC50) were found to 0.30 and 0.24 μl/cm3 of A. sativum oil after 24 and 48 h exposure of S. oryzae adults respectively. In contact toxicity assay, median lethal concentrations (LC50) were found to 0.17 and 0.13 μl/cm2 of A. sativum oil after 24 and 48 h exposure of S. oryzae adults respectively. A. sativum oil showed significant feeding deterrent activity in S. oryzae adults. Exposure of S. oryzae adults to sub-lethal concentrations of A. sativum oil significantly inhibited oviposition and acetylcholinesterase enzyme (AchE) activity in a concentration dependent manner.


Keywords: Allium sativum, essential oil, Sitophilus oryzae, insecticides

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URN: http://nbn-resolving.de/urn:nbn:de:0000easl.v3i2.878


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