Why mosquitoes, cockroaches, ants and termites all surge in June, and the checks that keep them out.
Rain does three things at once: it floods soil nests, forcing ants and termites to move indoors; it fills every container and drain with the standing water Aedes and Culex mosquitoes need to breed; and it raises indoor humidity to the level cockroaches and silverfish thrive in. In Mumbai and Navi Mumbai the effect is immediate — activity typically spikes within days of the first sustained showers.
Aedes aegypti, the dengue vector, breeds in clean stagnant water and completes its cycle from egg to adult in roughly seven to ten days. Emptying and drying every water-holding container once a week breaks that cycle before adults emerge — it is the single most effective mosquito control measure available to a household, and no amount of fogging replaces it.
A pre-monsoon general pest treatment in May or early June is the most cost-effective timing of the year: it targets cockroaches, ants and crawling insects before the population multiplies, rather than fighting an established infestation in July.
Fogging knocks down adult mosquitoes for a short period only. Lasting control needs larval source reduction — removing or treating the standing water where they breed.
Indoor treatment is unaffected. Outdoor perimeter treatment can be diluted by heavy rain, which is why external work is scheduled between spells and repeated during the season.
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