Comparison of mosquito larvicidal formulations of diflubenzuron on culex pipiens mosquitoes in Belgrade, Serbia
2022
Pešić, Branislav | Kulišić, Zoran | Teodorović, Radislava | Trailović, Saša M | Djokić, Vitomir | Djordjevic, Milutin
Culex mosquitos are important infectious diseases vectors in temperate and tropicalregions of the World, affecting nearly 350 million people in both developed anddeveloping countries. Our approach was to “recycle” the well-established larvicide, andby studying the tablets, pellets and granules as floating or sinking formulations, wefound a method to optimise the use of diflubenzuron against Culex pipiens mosquitoesin field conditions.A standard WHO procedure was used to test the larvicide efficacy. The combinedefficacy of all floating formulations was 10.7% higher than sinking preparations (p-value=0.002) and that maximised throughout the experiment on days 14 and 21, (p-values0.012 and 0.008, respectively). All floating formulations kept their efficacies above70% until day 21 of the experiment, while the mortality of sinking designs droppedsignificantly after day 14. The lowest efficacy was observed when sinking granules wereused and the highest when floating tablets were applied in the canals. Only the floatingtablets showed no significant changes in efficacy from day 1 to 21, but then that efficacydrops sharp until day 35.Since the larvae spend most of their time on the surface of the slow-moving watersto breathe, and floating pellets and tablets are made of materials that can serve asfood sources, we conclude that these formulations have a higher efficacy, at least inconditions of non- or slow-moving waters. This study shows the importance of asystematic approach to reformulation of old, already proven and environmentally safelarvicides which can control the mosquito populations and their spreading of variouspathogens.
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