Experiments show that two species of mosquitoes change their behaviour after exposure to five common pesticides, which could make the chemicals less effective
Culex quinquefasciatus
– to non-lethal doses of five commonly used pesticides. Around 200 mosquitoes were introduced to each pesticide, all of which were female. After exposure, the mosquitoes underwent two tests. In the first, the insects were placed in a box with food at the other end. The mosquitoes and the food were separated by a net laced with the same pesticide they were previously exposed to.mosquitoes that had been pre-exposed passed through the net, compared with 57.7 per cent and 54.4 per cent respectively that hadn’t been exposed before.
These findings show that mosquitoes are capable of learning behavioural resistance to pesticides. “What is quite interesting is that mosquitoes feel ill effects from the pesticides,” says Tripet. “They are capable of understanding that they’re uncomfortable, and they should avoid that experience.” Tripet hopes these findings will help to inform new strategies for managing mosquitoes. For example, he suggests mosquitoes may be slower to learn avoidance behaviour if pesticides are combined with other smells that they find attractive.
France Dernières Nouvelles, France Actualités
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