Abstract:
In recent years, the usage of environmental friendly and biodegradable natural
insecticides of plant origin have received and renewed attention as an effective agent
for disease vector control. For date, there is no vaccine for dengue which is spread by
the bite of infected Aedes mosquitoes. This study was carried out to examine the
comparison of effect between three parts of Azadirachta indica plants that were
extracted and tested against Aedes aegypti larvae. Fruit, leaf and bark of A. indica was
extracted using 98.9% of methanol and tested against third instar Ae. aegypti larvae
under laboratory condition. Exposure was done for 24 hours in the concentration of
0.1250, 0.2500, 0.5000, 1.0000 and 2.0000 mg/ml. LC50 values obtained for crude
extract of A. indica fruit, leaf and bark were 0.2730, 0.3041 and 0.4581 mg/ml. There
was significant difference (P<0.05) for fruit, leaf and bark. This shows that each part
provides different level of toxicity effect for vector control which is friendly to the
environment with fruit extract posses higher toxicity effect. This study revealed that the
extracts from A. indica are promising as botanical inseticides against Ae. aegypti.
