15 years of mosquito control
How mosquito numbers in the village of Österfärnebo have changed:
The diagram shows an example of mosquito abundance in the Nedre Dalälven region before and after the start of floodwater mosquito control in the year 2002. In the village of Österfärnebo, enormous abundance of mosquitoes were documented in the summer of 2000 with a maximum of 23,000 mosquitoes per trap and night, to be compared to recent years with a maximum of 19 mosquitoes per trap and night. Our goal to keep mosquito abundance below 500 individuals per trap and night has clearly been achieved.
Floodwater mosquito abundance variation is related to occurrence and magnitude of floods during spring and summer. Thus, we also show the waterflow of the River Dalälven at Långhag, upstreams of the Nedre Dalälven region. Floodwater mosquito control with VectoBac G has resulted in very low abundance of floodwater mosquitoes even during years with high and numerous flood events (2008, 2009, 2010, 2012 and 2015). In such years, production of blood-seeking floodwater mosquitoes would have been massive without our successful VectoBac G treatments. Some years, for example 2011 and 2013, no floods occurred during spring and summer, and in these years no control measurements were needed.