This hasn't been my experience. Once I let my lawn get quite tall (grass that was maybe 4-5 inches), and I had crazy mosquitoes. When I finally mowed that grass

This hasn't been my experience. Once I let my lawn get quite tall (grass that was maybe 4-5 inches), and I had crazy mosquitoes. When I finally mowed that grass, they came up in swarms. I then learned, and have kept it short since then and voila, no mosquitoes.