In the Pyrénées-Orientales, Hérault and Gard, at least 40% of municipalities are now colonized by the tiger mosquito. In an attempt to stem its progress, the Interdepartmental Agreement for Mosquito Control is launching the VECTRAP project. We explain this massive trapping strategy to you.
In Hérault, Castelnau-le-Lez near Montpellier is one of the municipalities selected to participate in the VECTRAP project, which aims to curb the spread of the tiger mosquito.
For the purposes of this experiment, which starts this summer 2021 and will last until 2023, agents of the Interdepartmental Agreement for Mosquito Control (EID) are setting traps in the gardens of certain residents. For them, getting rid of the insect has become a real headache.
Traps that capture females before they lay eggs
The principle is simple: a nesting trap is installed in a dark corner of the garden. Yvon Perrin, in charge of VECTRAP project to the EID, explains how it works:
Females are attracted to the water that is at the bottom and can only enter through the top opening of the trap. Once inside, the structure prevents them from reaching the water and laying eggs there, they then try to come out but come up against a wall coated with a sticky paste of which they remain captive.
Three years to validate the experience
To assess this new control strategy, several traps must be set in the summer in the same sector of the town. Grégory L’Ambert, head of the “Methods and research” pole at EID, specifies the aim of this experiment:
The idea is to see to what extent mass trapping can help limit the proliferation of the tiger mosquito. This has never been described and is not known in the scientific literature. This 3-year project is therefore necessary to experiment with different approaches.
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Besides Castelnau-le-Lez, Clapiers and Saint-Clément-de-Rivière are also participating in the VECTRAP project. Nearly 400 traps have already been installed in 8 districts of these 3 Hérault municipalities.
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