Weeping willows do not attract mosquitoes. While the trees do attract an array of insects, but not mosquitos. If anything, willows may reduce the amount of mosquitoes in an area, because they use up standing water sources that may draw the insects near. The water consumption of weeping willows has the ability to reduce standing water levels around low areas in your landscape. The trees may be associated with mosquitoes due to willows often being planted near large bodies of water.