Entomology and
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Creative Commons License 2016 Volume 3 Issue 2

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

M. K. Chaubey
Abstract

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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Entomology and Applied Science Letters is an international double-blind peer reviewed publication which publishes scientific research & review articles related to insects that contain information of interest to a wider audience, e.g. papers bearing on the theoretical, genetic, agricultural, medical and biodiversity issues. Emphasis is also placed on the selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance. In addition to full-length research articles and reviews, the journal publishes interpretive articles in a Forum section, Short Communications, and Letters to the Editor. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.

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Institute of Pharmaceutical Sciences (IPS) , University of Veterinary and Animal Sciences, Lahore Pakistan.
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Entomology and Applied Science Letters supports the submission of entomological papers that contain information of interest to a wider reader groups e. g. papers bearing on taxonomy, phylogeny, biodiversity, ecology, systematic, agriculture, morphology. The selection of comprehensive, revisionary or integrated systematics studies of broader biological or zoogeographical relevance is also important. Distinguished entomologists drawn from different parts of the world serve as honorary members of the Editorial Board. The journal encompasses all the varied aspects of entomological research.