It’s in how many days they hatch after a high rain

Mosquitoes: After the storm, this invisible countdown launches the invasion in less than 10 days – It's how many days they

They bite us, but above all, they are ahead of us. Consequently, Barely the dissipated storm and the full gutters, an invisible wave is already organized: that of mosquitoes. Meanwhile, Barely 24 to 48 hourstheir eggs. however invisible to the naked eye, hatched massively in each forgotten puddle, each watering saucer left in the open. Similarly, If this natural ballet was not as aggressive, we would almost applaud its surgical precision.

And the most amazing? For example, This is only the beginning. In addition, Because once the eggs are bloomed, the larvae do not wait a week to become adults. Nevertheless, In the moist heat from the end of June. Moreover, the adult mosquito is ready to sting it’s how many days they in less than 10 daysaccording to the Pasteur Institute. For example, Clearly: your nap on the terrace could very quickly turn to the epidermal carnage. However, except to react at the right time.

From storm to flight: a perfectly tied lightning cycle – It's how many days they

Science confirms this: mosquitoes are masters of timing. Therefore, According to a study of Journal of Medical Entomologysome species such as Aedes albopictus (the tiger mosquito) can emerge in 24 hours After a downpour. In addition, if the temperatures exceed 25 °C. A temperature now common in many regions of France at the end of June.

The complete cycle. from egg to adults, varies between 7 and 10 dayswith peaks at 5 days Under the ideal conditions, alerts theEID Méditerranée (Interdepartmental Agreement for Demoustication of the Mediterranean it’s how many days they Littoral). And this does not concern an isolated mosquito: each female can lay to 200 eggs both. Do the calculation. A simple puddle is potentially an army of biting ready to melt on your calves even before the soil. had time to dry.

In France. theARS (Regional Health Agency) confirms that the tiger mosquito is today Established in 78 % of departmentswhich makes it a serious sanitary threat for the summer of 2025.

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In less than 48 hours after a downpour, mosquito eggs can hatch in a simple watering saucer left in the open air.

Why does the rain trigger such a frenzy?

The answer is it’s how many days they biological. Many species, especially Aedes vexanswait for the water to accumulate to trigger their hatching. Eggs can remain viable Several months dryawaiting the necessary humidity. We are talking about a phenomenon called “synchronized hatch”: After a thunderstorm, the eggs all activate at the same time. Result: a sudden explosion of larvae in the following days.

Even more devious. the tiger mosquito does not necessarily lay In water, but just above : in the anfractorsities of pots, gutters, children’s toys … As soon as the rain rises the level, it activates the hatch. A rain of 15 mm is enough, depending on Public health France (SPF). And according toIRD (Institute of Research for Development). these weather conditions coupled to an increase in temperatures make human exposure of human exposure 60 % in it’s how many days they untreated areas.

The 4 good gestures to adopt within 48 hours after a downpour

Only this part contains a flea list:

To avoid an explosion of mosquitoes in your garden. balcony, these reflexes must be automatic the day after a thunderstorm:

• Empty all saucers, pots, watering cans or basins containing stagnant water;

• Cover the rainwater collectors with a fine canvas or an anti-insect net;

• Clean the gutters, even partially obstructed, where mosquitoes love to lay;

• Place a biological larvicide (type Bti, Bacillus thuringiensis israelensis) in non -empty zones such as evacuation looks.

Bonus advice: do it Before eggs bloomor within 24 to 48 hours. Because once the larvae it’s how many days they visible, it is often already too late. L’EID Atlantic recommends increased monitoring during stormy periods, with immediate application of BTI in risk households.

Mosquitoes: the alert calendar to know for this summer

Specialists inEID Atlantic. now talk about “proliferation windows”Linked to summer rains. In summary: The more it rains, the more it stings. According to their models. a rain of more than 10 mm followed by 4 days of sun and minimum 25 ° C triggers a larval peak within 3 daysand a peak of bites 7 to 9 days later.

In June 2025, the conditions were met: high temperatures, frequent thunderstorms, residual humidity. According to Météo-Francenext to 42 departments are on alert thunderstorms this week, which it’s how many days they means that proliferation is already underway.

In some municipalities of Girondeof Hérault. Ourthe demustication services are already mobilized, with intensified larvicide treatments Around sensitive areas. But on an individual scale, vigilance is played out at home. And it starts … under a simple geranium saucer.

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According to the Pasteur Institute, a mosquito can go from the egg to the adult pricker in less than 10 days in case of high heat.