Fig 3.

Area of North Germany in the federal states of North Rhine-Westphalia and Lower Saxony checked for Ae. j. japonicus in 2013 (a), 2014 (b) and 2015 (c). Red squares: grid cells positive, green squares: grid cells negative by cemetery inspection, circles: grid cells with Ae. j. japonicus submissions to the ‘Mueckenatlas’; figures in the grid cells denote findings in May/August with ‘1’, ‘2’, ‘3’ representing the number of cemeteries inspected until Ae. j. japonicus was found, ‘X’ representing three negative cemeteries in case only one of the two collection seasons was positive, and ‘-‘ meaning not sampled. The area framed in bold marks the reference area used for statistical analysis.