Flooding per se, does not lead to mosquitoes. It is the water that stands AFTER the flooding that creates opportunities for mosquitoes to breed. Heavy, frequent rainfall may lower mosquito population numbers because there is no standing, stagnant water in which the larvae can feed on grow (mosquito larvae do not live in running water).
Iowa State University
Jesse, Laura C.H., "Flooding and Mosquitoes" (2008). Integrated Crop Management News. 910.
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