Mukesh K Chaubey


Cinnamomum tamala (Lauraceae) essential oil and its major constituent, eugenol were evaluated for repellent, insecticidal, feeding inhibitory, oviposition inhibitory and acetylcholinesterase enzyme inhibitory activities in rice weevil, Sitophilus oryzae. In repellency assay, C. tamala oil and eugenol repelled S. oryzae adults significantly at 0.2% concentration. Essential oil of C. tamala and eugenol caused fumigant and contact toxicity in S. oryzae adults. In fumigation toxicity assay, median lethal concentrations (LC50) were found 0.249 and 0.198 μl/cm3; and 0.167 and 0.152 μl/cm3 of C. tamala oil and eugenol after 24 and 48 h exposure of S. oryzae adults respectively. In contact toxicity assay, median lethal concentrations (LC50) were found 0.241 and 0.218 μl/cm2; and 0.185 and 0.126 μl/cm2 of C. tamala oil and eugenol after 24 and 48 h exposure of S. oryzae adults respectively. Essential oil of C. tamala and eugenol showed feeding deterrent activity and oviposition inhibition activity in S. oryzae adults when exposed to sub-lethal concentrations. Fumigation of S. oryzae with C. tamala oil and eugenol inhibited acetylcholinesterase enzyme (AchE) activity. This study concludes that C. tamala and its components can be used as alternative in management of stored-grain insects.


Cinnamomum tamala; essential oil; Sitophilus oryzae

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