Colorado Potato Beetle (Leptinotarsa decemlineata Say) Control Potential of Essential Oil Isolated from Iranian Cymbopogon citratus Stapf
2017
Asgar Ebadollahi, University of Mohaghegh Ardabili, Ardabil, Iran | Jafar Geranmayeh, Ministry of Agriculture-Jihad, Ardabil, Iran | Morteza Kamrani, University of Mohaghegh Ardabili, Ardabil, Iran
Colorado potato beetle is a most destructive insect pest of potato throughout the world. Although utilization of chemical insecticides is a main method for management of this pest, their negative side-effects such as threat to humans and the environmental pollution prompted researchers to search for natural alternatives. Recently plant essential oils with low or without side-effects against noun-targeted organisms and with high availability were considered as safe bio-pesticides. In the present study, toxicity of essential oil of Iranian lemongrass, Cymbopogon citratus Stapf, was evaluated against 3th instar larvae and adults of Colorado potato beetle by a leaf dipping method. Results displayed essential oil had notable toxicity against both larvae and adults after 24 and 48 h exposure times. Probit analysis revealed LC50 values (lethal concentration to kill 50% of population) with 95% confidence limits were 10.32 (9.17 - 11.72) and 7.76 (6.80 - 8.74) microliter/ml for larvae and 6.27 (4.82 - 8.15) and 4.35 (3.24 - 5.62) microliter/ml for adults after 24 and 48 h, respectively. Based on regression analysis, a positive correlation between log concentration of essential oil and insect mortality was achieved. Results indicated C. citratus essential oil can be candidate as a natural alternative to the harmful chemical insecticides in the management of Colorado potato beetle.
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