The population abundance of Phlebotomus argentipes Annandale & Brunetti was
studied between January 1986 and December 1987 at 2 sites in West Bengal,
India, in relation to 8 ecological parameters lair temperature, rainfall, w
indspeed, relative humidity, soil moisture, soil temperature, soil pH, and
soil organic carbon). Sand flies were present throughout the year with mini
mum abundance in winter months and maximum during monsoon and postmonsoon m
onths. Correlation analysis examined pairwise relationships among the 8 eco
logical parameters and P. argentipes abundance. Multiple linear regression
of sand fly abundance on the 8 parameters showed that average soil temperat
ure and soil moisture, both recorded 1 mo earlier, were associated positive
ly with sand fly abundance. These findings have important implications for
Indian kala-azar disease control and prevention. Effective vector managemen
t programs are needed most when weather conditions favor increased sand fly
abundance, given that greater sand fly abundance increases the likelihood
of host-vector contact and the transmission of Leishmania.