Question

Why do we find more numbers of houseflies during the rainy season?

Answer 1

Hint:The rainy season sees an increase in numbers of many insect species. A change in plant growth, food availability, higher levels of moisture, all play a role in the increase in breeding of these insects, some of which we admire, others are an annoyance.

Complete answer:
Though house flies breed throughout the year, this activity increases during the rainy season as a result of all the following factors:

Houseflies live closely in association with human settlements all over the world. They feed on our food as well as our waste products including human waste. Houseflies are also very ready to feed on rotting material.

The lifecycle of the housefly starts with the laying of eggs on organic waste. These may take a few days to a couple of weeks to hatch depending on the environmental temperature. During the cooler humidity of the rainy season the adult flies also survive for longer periods of time. So there are more flies being born, and more adults surviving at the same time. This works as a self-replicating process, with an increase in breeding activity as well.

The rainy season also makes the environment much wetter. During drier conditions, house flies lay their eggs deeper into the food waste and the maggots that hatch from them are not as visible. When the surface is wet, flies tend to lay their eggs on the surface, or close to the surface of the food waste. The number of hatched maggots is also more visible, making it appear that there are more flies.

Note:Besides the direct action of human waste lying around rotting during the rains. There is also more rotting vegetation available as well as increased sewage flow and overflowing drains enabling the feeding and breeding of these insects.