Abstract

Essential oil (EO), from Clausena anisata, was evaluated for their efficacy (fumigant and repellent activities) against Sitophilus oryzae. Result revealed that C. anisata showed 82% fumigant toxicity (insect mortality) at 160μL/L concentration after 24h observation period. C. anisata exhibited LC50 value of 17.84μL/L concentration for fumigant toxicity. The insect movement behaviour (repellent) was observed in two different concentrations of 10 and 50μL for a period of 3h. Maximum repellent activity (- 0.25) was observed at 50μL/L concentration against S. oryzae after 3-h observation. At 3, 6 and 12μL/L concentrations of C. anisata oil significantly reduced the protein content and total esterase activity of S. oryzae.

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