TOXIC EFFECT OF UVARIA NARUM (DUNAL) WALL AND ITS SYNERGISTIC PROPERTY WITH TEMEPHOS AGAINST THE FILARIAL VECTOR, CULEX QUINQUEFASCIATUS SAY (DIPTERA: CULICIDAE)

E. Pushpalatha*

ABSTRACT

Larvicidal property of methanol extract of Uvaria narum leaf tested on III and IV instar larvae of the filarial vector, Culex quinquefasciatus Say and estimated 24 hr LC50 as 376.45 and 344.25 ppm for III and IV instar respectively. Temephos, the synthetic larvicide used for the present study was also subjected to find out the lethal concentration and estimated their 24 hr LC50 as 0.022 and 0.02 ppm against III and IV instar larvae, whereas in combination of the selected pesticides temephos and U. narum leaf extracts shows an LC50 value of 29.45 and 36.25 ppm respectively for III and IV instar larvae of Cx. quinquefasciatus. The data on the joint action of mixtures and the co-toxicity factor for III and IV instars (47.5% and 50.15%) pointed to its effects as potentiation, against the larvae of Cx. quinquefasciatus.

Keywords: Uvaria Narum, Temephos, Cx. Quinquefasciatus, Synergistic Activity.