Mosquitoes and the Nigerian rainy season

Why the rains change everything

A mosquito does not need a pond. It needs standing water, and it needs it for about a week. That is the whole story of why numbers rise once the rains start in April and stay high until they ease around October.

The water that matters is rarely the water you would think of. It is the base of a plant pot, the lid of a discarded tin, a wheelbarrow left out, the ridges in a folded tarpaulin. A bottle cap holds enough for a mosquito to complete a generation.

This is why spraying alone rarely feels like it is working during the rains. You are dealing with the adults in the room while the next generation is maturing twenty steps away.

Where they actually breed in a Nigerian compound

Walk the compound after rain and look for anything holding water. In most homes the list is short and repetitive: the water storage drum, the gutter that no longer drains, buckets left outside, old tyres, the saucer under a potted plant, and any building materials stacked in a corner.

The storage drum deserves particular attention, because it is both the largest volume and the one people are most reluctant to disturb. A tight lid solves it entirely.

Scrubbing matters as much as emptying. Mosquito eggs are laid on the inner wall just above the water line and survive drying out, so a drum that is tipped out but not scrubbed can repopulate the moment it is refilled.

What reduces bites, in order

First, remove the water. It costs nothing and it removes the next generation rather than the current one. Once a week is enough, but it has to be every week through the rains.

Second, keep them out of the building. Screens on windows and doors, and repairs to the ones already torn. A screen with a hole in it is a doorway with a suggestion attached.

Third, cover up at dusk and dawn. That is when biting activity peaks, and long sleeves at those two windows of the day do more than most people expect.

Fourth, treat the room. An aerosol handles what is already indoors: close the doors and windows, spray, wait, then ventilate before anyone returns. That order matters, and it is printed on the can.

One thing worth being clear about

Mosquitoes are the vector for malaria, and Nigeria carries a large share of the global burden. Reducing bites and removing breeding sites is a sensible thing for any household to do.

But no insecticide, incense stick or repellent on this site prevents, treats or cures malaria or any other illness. They kill or repel insects. If someone in your home is unwell, that is a matter for a clinic, not a can.