Seasonal and spatial quantitative changes in Aedes aegypti under distinctly different ecological areas of Lahore, Pakistan.

OBJECTIVE To find out the variations in larval and adult density of Aedes aegypti in different seasons under different ecological conditions. METHODS This study was undertaken in all the nine towns and the cantonment board of Lahore, Pakistan, during four seasons in 2011, 2012 and 2013. Ovitraps were placed in houses in residential areas and were visited weekly in rainy and post-rainy seasons each year to determine the presence of immature and mature forms of Ae.aegypti. Densities of these were measured by ovitrap index and per man hour density, respectively. Correlation coefficient and coefficient of determination between ovitrap index, per man hour density and climatic variables were established. SPSS 19 was used for data analysis. RESULTS Ovitrap index and per man hour density values were lower in early rainy season compared to late rainy and early post-rainy seasons. These became lowest in late post rainy season. Strong correlation coefficient and its determination between ovitrap, per man hour density and climatic variables were observed.? CONCLUSIONS Density of immature and mature forms of Ae.aegypti was influenced by environmental degradation.