Larvicidal, adulticidal, and oviposition-deterrent activity of L. essential oil to .

BACKGROUND AND AIM

is a primary vector of many arthropod-borne diseases. One of the diseases, dengue fever, is an endemic disease in Indonesia causing high mortalities for decades. There are no preventive and specific treatments for dengue so far. Therefore, prevention of this disease largely depends on the mosquito control. Since resistance to chemical insecticides occurred worldwide, the study on alternate and new mosquito insecticides are mandatory. This study aimed to demonstrate the effect of essential oil from L. in the larval and adult stages, as well as its influence on oviposition activity of mosquito.

MATERIALS AND METHODS

efficacy was evaluated in various stages of development. For the larvicidal activity, larvae instar III stage was used. Adulticidal assay in this experiment was performed using newly emerged . For oviposition assay, mated was tested for their responses to -treated and non-treated ovitraps.

RESULTS

L. - adulticide activity was effective with a concentration of 2.5 μl/ml, caused 100% mortality within 15-30 min. Larvicide activity was observed after 1 h, 24 h, and 48 h post-treatment with LC183, 92.7, and 59.8 ppm and LC 637, 525, and 434.7 ppm, respectively. Oviposition activity index was -0.917 in 1000 ppm. In addition, the eggs number of oviposition with 100 ppm of essential oil L. was 5 times lower than the control.

CONCLUSION

This study demonstrated clearly that essential oil derived from L. potentially acts as alternate bioinsecticide to control population. The application can be varied or combined in different stages of mosquito development.