Abstract:
The larvicidal potential of kalachuchi aqueous crude leaf extract against
Aedes aegypti larvae was investigated. Five concentrations kalachuchi
crude leaf extract (50 g¾, 25 g¾, 12.5 g¾, 6.25 g¾, and 3.125 g¾) were
used in determining the mean percent mortality of Aedes aegypti larvae
after exposure to 48 hours. Each having three trials with three replicates.
This study also considered the morphological changes that were observed
among the dead larvae. These included darkened or burnt appearance of
the larvae, loss of antennae, lack of setae, and misaligned abdominal
segments. Probit analysis statistical method (NCSS program) was utilized
to determine LC,0 and LC9-0_ The mean percent mortality obtained for 50
g¾, 25 g¾, 12.5 g¾, 6.25 g¾, and 3 .125 g¾ kalachuchi crude leaf extract
concentrations were 95.57 g¾, 47.77 g¾, 26.67 g¾, 21.1 g¾, and I I.I
g¾, respectively. These data show that there is a progressive increase in
the mean percent mortality with increasing concentrations of kalachuchi
crude leaf extract concentrations. The values obtained for the lethal
concentrations after 48 hours were 17.97 g¾ ± 2.4290 and 82.02 g¾ ±
21.6598 for LC,o and LC90, respectively. Based on the morphological
observations and on the LC,o and LC,o values obtained, kalachuchi crude
leaf extract has a potential of being a larvicide of Aedes aegypti.
