Every month there is a fee on my city utility bill for mosquito control. Laramie is in a river valley. The mighty Laramie River rises with the snow melt, flowing into low lying areas, forming perfect breeding grounds for mosquitoes. Late spring rains and snows leave enough water everywhere the water can pool even far from the flood plain. When the nights warm up enough, the billions of eggs laid by the industrious insects hatch. The blood letting begins. Now is the time to buy stock in insect repellent the smell of which replaces he scent of lilacs.
When the human and other warm blooded residents of the area are sufficiently drained, the city begins its spraying program. Late at night you can hear the drone and whoosh of the sprayers as they drive he streets fogging the city with chemicals which kill the mosquitoes. God only knows what they do to the rest of us.