Vol. 2, Issue 6 (2017)
Evaluation of repellency and antifeedant activities of Saraca asoca and Terminalia arjuna Bark extracts against Sitophilus oryzae
Author(s): S Gomathi, KM Subbu Rathinam
Abstract: The rice weevil Sitophilus oryzae (L.)(Coleoptera: Curculionidae), is one of the mostimportant stored grain pest in India and has beenspread worldwide by commerce. Plants have developed subtile chemical defense mechanisms against insects and other organisms; these defense mechanisms do not generally produce immediate death but do affect common biochemical and physiological functions. In this study, we evaluated the repellency and antifeedant activities of Saraca asoca and Terminalia arjuna bark extracts to control Sitophilus oryzae. The repellent activityagainst S. oryzae adults was more pronounced inmethanol extract of Terminalia arjuna barkas compared withSaraca asoca bark extract. The antifeedant activity against S. oryzae adults was greaterinmethanol extract of Terminalia arjuna barkas compared withSaraca asoca bark extract. The potential insecticidal, repellent and antifeedant activity of Saraca asoca and Terminalia arjuna bark extracts might be present in bioactive compounds. Therefore, Saraca asoca and Terminalia arjuna could be considered an ideal grain (Rice) protectant from the point of viewof seed viability and safety to mammals.
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