Repellent activity of mixed formulation of two essential oil (lemon grass and clove oil) against grasshopper / Nur Amalina Othman

Two essential oils extracted from the plant species lemon grass (Cymbopogon citratus) and clove (Syzygium aromaticum) were involved in the repellent activity against the grasshopper. The mixture of the two essential oil showed the best repellency over the single essential oil. The aim of the study was determine the repellent activity of two essential oil that were lemon grass (Cymbopogon citratus) and clove oil (Syzygium aromaticum) and their mixed formulation to the grasshopper. Besides, the efficiency of the essential oil towards the grasshopper at five different concentration of the ethanol (5%, 10%, 20%, 50% and 100% were examined. Other than that, the essential oils were extracted by using the rotary evaporator machine in the laboratory. The mixed formulation of essential oil (clove oil and lemon grass oil) exhibited the higher repellency against the grasshopper at 100% and 50% concentration of the ethanol when diluted together with the mixed formulation of the essential oils from about 85% to 90% of repellency compared to 20% concentration with 80% repellency, 10% concentration with 75% repellency and 5% concentration with 80% repellency. The control site that was not treated with essential oils was smeared with the chemical insecticides and show the lower in repellency about 73% compared to the five concentration of essential oils. This shows that the essential oils from the plant was more effective and safe to be used compared to the chemical repellent. Lastly, the natural or organic extraction from the plant will not cause the pollution to the environment and safe to be used and five concentration of the essential oils (100%, 50%, 20%, 10% and 5%) have been used to reduce the population of the grasshopper.