First record and establishment of invasive mosquito Aedes japonicus in Croatia

2015 
The Asian bush or rock pool mosquito Aedes japonicus (Theobald, 1901) is a new invasive species of mosquitoes found and establishment in Croatia. It has been first discovered in Europe in 2000 and the new findings and expansion have been confirmed in a number of countries ever since. Due to its presence in the areas bordering Croatia (Slovenia and Austria), a research was carried out in the summer of 2013 in Krapina-Zagorje County, in the north-western Croatian area bordering Slovenia. The ovitrap method and sampling larvae were used. During 2013 the research was being carried out at seven locations, six of which were the most frequent places and ways of invasive mosquitoes ingress (points of entry). The first finding of Ae. japonicus was detected at the cemetery in Đurmanec. The wooden stick with eggs were taken 30 August from the trap at the cemetery and having been searched they were dipped into the water in laboratory conditions of Vector Control Department, Institute of Public Health „Dr. Andrija Stampar“, Zagreb. 12 September the first instar larvae of the species were developed. The larvae were then collected in flower vases and fountain at the cemetery. Ae. japonicus was found also in the area of Macelj, the border crossing with Slovenia. The study was continued in the year 2014, from July to October, at eight locations of Krapina-Zagorje County. The species was found with significantly higher abundance and presence in places of last year’s findings, but also on new locations: Hum na Sutli, Krapina and Veliko Trgovisce. On the Zagreb area that borders the Krapina- Zagorje County, an invasive mosquito research is being carried out for couple of years now, but Ae. japonicus has not been found.
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