Fig. 1

Anopheles larval density in natural breeding habitats dominated by four grass species, Echinochloa pyramidalis, Echinochloa stagnina, Typha latifolia and Cyperus papyrus, assayed in early (top) and late (bottom) September. The mean larval densities with different letter designations are significantly different from one another (univariate general linear model with a Tukey’s post hoc analysis; P < 0.005). Error bars represent the standard error of the mean