{"id":379383,"date":"2025-11-14T23:09:10","date_gmt":"2025-11-14T23:09:10","guid":{"rendered":"https:\/\/www.europesays.com\/us\/379383\/"},"modified":"2025-11-14T23:09:10","modified_gmt":"2025-11-14T23:09:10","slug":"phoenix-mosquito-populations-boom-amid-heavy-rainfalls","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/us\/379383\/","title":{"rendered":"Phoenix mosquito populations boom amid heavy rainfalls"},"content":{"rendered":"

Every time you step outside, you pick up two or three bites. You\u2019re swatting miniature pests left and right, and it seems like something is always buzzing in your ear.<\/p>\n

No, you\u2019re not crazy. The mosquitoes in Phoenix have been fucking awful this year.<\/p>\n

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The amount of mosquitos that I have experienced in Phoenix this past month feels like something out of Exodus<\/p>\n

\u2014 uncanny valley girl (@girloftheminute) November 4, 2025<\/a><\/p><\/blockquote>\n

Mosquito complaints made to the Maricopa County Vector Control Division, which monitors and deals with mosquito populations, have increased 400% compared to a year ago. In 2024, the county received about 1,500 complaints, division manager John Townsend told Phoenix New Times. This year, complaints have skyrocketed to 6,000 \u2014 so far.<\/p>\n

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Townsend also said that while the Valley has typical mosquito complaint hotspots \u2014 particularly in the East Valley \u2014 complaints have come from all over the county this year. Vector Control sets traps to monitor mosquito activity at 850 sites across the Phoenix metro area and is finding a lot of mosquitoes where they usually are not.<\/p>\n

\u201cTypically, in the southeast Valley \u2014 Queen Creek, Chandler, Gilbert and Mesa, and areas with flood irrigation \u2014 we get a lot of mosquitoes and complaints because they\u2019re irrigating their property every two weeks,\u201d Townsend said. \u201cThis past month, it\u2019s been more widespread. We have a lot of areas collecting water that normally don\u2019t.\u201d<\/p>\n

The mosquito problem in Phoenix hasn\u2019t been this bad in nearly a decade, he said. \u201cThe last time it was close to this activity was eight or nine years ago,\u201d Townsend said, \u201cwhen, later in the year, three different hurricanes came up from Mexico.\u201d<\/p>\n

If you\u2019re thinking, \u201cHuh, we\u2019ve had a lot of rain this year, too\u201d \u2014 congrats, you\u2019re on your way to earning a mosquito PhD. Phoenix\u2019s mosquito situation was remarkably worse than usual this October because of all the rain the Valley got at the end of September.<\/p>\n

Those storms left standing water that settled all over the Valley, creating a perfect egg-laying environment for mosquitoes. The warm (but not excessively hot) temperatures in late October provided ideal conditions for those pesky buggers to thrive.<\/p>\n

\"aSeveral different species of mosquito live in the Valley.<\/p>\n

Meet the mosquitoes<\/p>\n

One type of mosquito has thrived more than others.<\/p>\n

More water in unusual places, like buckets or empty pots, means that floodwater mosquito populations have popped off. Thankfully, floodwater mosquitoes bite during the day and don\u2019t carry diseases as much as other species in the Valley. These annoying, smaller insects are what experts consider to be a \u201cnuisance mosquito,\u201d Townsend said, ready to\u00a0 \u201cruin your picnic or barbeque\u201d but not your health.\u00a0<\/p>\n

But not all mosquitoes are created equal. Kelsey Lyberger, a mosquito ecology researcher at Arizona State University, said that the mosquito explosion has been diverse.<\/p>\n

\u201cInterestingly, it wasn\u2019t just a single species,\u201d Lyberger said. \u201cWe\u2019re seeing a whole bunch of species, like floodwater species to Yellow Fever-carrying mosquitoes (Aedes aegypti), to a couple of Culex species, which transmit West Nile Virus.\u201d<\/p>\n

Those species, unlike the floodwater mosquitoes, tend to live in and around more permanent bodies of water. Their activity has also increased substantially. The Valley has seen 46 cases of West Nile Virus this year, more than double the figure last year. In addition, one person tested positive last week for St. Louis Encephalitis, another disease carried by Culex mosquitoes.<\/p>\n

However, Lyberger isn\u2019t too worried about the ongoing threat of those viruses.<\/p>\n

\u201cIt\u2019s late enough in the season that we don\u2019t expect West Nile to be a big threat anymore,\u201d she said. \u201cOnce those temperatures cool, those populations are going to drop off very quickly.\u201d<\/p>\n

The same pattern is expected with floodwater mosquitoes.<\/p>\n

\u201cHopefully, as the weather cools down, this floodwater mosquito activity will start to subside,\u201d Townsend said. \u201cWe\u2019re still seeing some in our traps, but not anything like what we were seeing a month ago.\u201d<\/p>\n

\"aA swarm of mosquitoes.<\/p>\n

Almost over?<\/p>\n

There\u2019s a complicating factor, though: rainstorms are expected to grip the Phoenix metro area intermittently from Saturday until the following weekend.\u00a0<\/p>\n

Mosquito survival \u2014 our human sanity \u2014 may depend on whether the moisture or the lower temperatures have a bigger effect on the bugs. The rain could lead to another wave of heightened mosquito activity, or the cooler temperatures could bring a drop.\u00a0<\/p>\n

\u201cI still think temperature is going to win out,\u201d Lyberger said. \u201cThere might be a nice habitat, but I don\u2019t expect to see any huge numbers in the following few weeks.\u201d<\/p>\n

Even when temperatures drop for winter, the current mosquito problem could come roaring back next spring. As both experts noted, mosquitoes can lay eggs that lay dormant for months \u2014 or, in some cases, a year.<\/p>\n

\u201cIf it\u2019s a relatively mild winter, I do think you\u2019d see boosted spring populations,\u201d Lyberger said. \u201cBut if it\u2019s a cold winter and they die out, I would go back to baseline prediction.\u201d<\/p>\n

If you want to prevent another mosquito-pocalypse, Townsend has an easy tip to stop floodwater mosquito populations from running wild in your space.<\/p>\n

\u201cAfter a rain, do yourself a favor and turn anything over in your backyard that\u2019s holding water,\u201d he said. \u201cYou\u2019ll do yourself a favor by not having these mosquitoes bugging you all the time.\u201d<\/p>\n

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