Mosquitoes and plants thrive where there is water. Farmers in arid regions who use irrigation systems to collect water also construct a mosquito breeding ground.
New research shows that irrigation systems malaria prone areas can cause an increase in local malaria risk that lasts for more than a decade. Even when health authorities mount a response to kill off mosquitoes using insecticides, the problem of malaria is still worse than before the open water.
“In these dry, fragile ecosystems, where increase in water availability from rainfall is the limiting factor for malaria transmission, irrigation infrastructure can drastically alter mosquito population abundance to levels above the threshold needed to maintain malaria transmission,” said lead author and University of Michigan graduate student Andres Baeza.
Baeza and her team studied cases of malaria in northwest India. Infrequent and inconsistent rain makes for more challenging farming and is why farmers employ various irrigation methods to ensure crop health. The study looked at the effects of a large irrigation project that will provide enough water to cover more than 47 million acres.