Figure 1From: Strategies of a thirteen year surveillance programme on Aedes albopictus (Stegomyia albopicta) in southern Switzerland End of the 1 st period: position of ovitraps and mean number of Ae. albopictus eggs in 2003 in the five surveyed districts. Most ovitraps appear as overlapped due to the low map resolution; positive ovitraps are shown at top layer.Back to article page