LARVICIDAL EFFECT OF FOUR PLANT EXTRACTS ON FILARIAL VECTOR CULEX PIPIENS.

Abstract

The larvicidal efficacy of four commercially a variable plant oils, with different concentrations, was tested against the third instar larvae of Culex pipiens. The larval mortality was determined each 12 hrs. Bioassays showed that larval mortality was varied according to the concentration and period of exposure to all the four plant oils. The LC50 and LC90 values were 0.29&1.02 µl/ ml, 4.70&43.90 µl/ ml, 79.80&154.90 µl/ ml and 119.00&237.9 µl/ ml for Lupinus, Citrullus colocynthis, Eruca sativa, and Lactuca sativa, respectively. It could be concluded that Lupinus oil was the most effective plant as it killed the larvae with lowest values of LC50 and LC90. On the other hand, it was found that Lactuca sativa had very low lethal effect on larvae of Culex pipiens.