Author contributions ID drafted the manuscript and revised it after comments of all co-authors. ID, TVL, KDW and AV carried out the mosquito identifications. ID, KDW, AS, AV, IV, JDW, JD, TVL and WVB collected data in the field and sorted the mosquitoes in the laboratory. WVB, ID and KDW managed the data. NS and JDW performed the DNA barcoding. WD and AV produced the morphological reference collection. WVB, ID, MM and RM coordinated the projects. MK performed the statistical analysis. All authors critically reviewed the manuscript. All authors read and approved the final manuscript. ; Data supporting the conclusions of this article are included within the article and its additional file. The datasets generated and analysed during the current study are available in the GBIF repository [44–50]. ; ADDITIONAL FILE 1: TABLE S1. Overview of the trapping methods used to monitor invasive mosquito species (IMS) in Belgium during the different years (and projects) and in different risk scenarios, indicating the number of traps or larval sampling visits per site and the frequency of trapping or larval sampling. TABLE S2. Aedes albopictus detections in Belgium between 2007 and 2020 at the ten points of entry (PoEs) per year including the sampling perimeter, collection and detection methods, collection (light grey) and detection (dark grey) period, control measures (X), number of individuals (total, females, males, larvae and eggs) and project. TABLE S3. Aedes japonicus detections in Belgium between 2007 and 2020 at the four points of entry (PoEs) per year including the sampling perimeter, collection and detection methods, collection (light grey) and detection (dark grey) period, the control measures (X), number of individuals (total, females, males, larvae and eggs) and project. TABLE S4. Aedes koreicus detections in Belgium between 2007 and 2020 at the two points of entry (PoEs) per year including the sampling perimeter, collection and detection methods, collection (light grey) and detection (dark grey) period, control ...