Mosquito surveillance programs have found that invasive species have become established in three counties in Iowa.

ISU surveillance activities have revealed data suggesting that the Aedes albopictus depicted here are colonized in three counties in Iowa.Credits: James Gathany, Centers for Disease Control and Prevention

In Iowa, you may find that this summer’s barbecue crashes new uninvited guests.

Mosquito surveillance, led by an entomologist at Iowa State University, reveals evidence of invading mosquitoes. Race First known as Aedes albopictus, it is to allow the species to survive the winter in three counties of Iowa and settle in those places. Previously, this species, which can transmit several diseases in one bite, has seasonally appeared in Iowa, Minnesota, and Wisconsin, while overwintering in the Illinois and Missouri regions. However, the harsh winters of Iowa were thought to prevent this species from creating permanent dwellings in Iowa, said Ryan, an associate professor of entomology and director of the ISU Institute of Medical Entomology. Smith said.

“For a long time it was thought that these mosquitoes couldn’t survive the winter here,” Smith said. “Our data show that they are here and they seem to be widespread.”

Aedes albopictus first appeared in Texas, USA in 1985. Since then, the species has gradually expanded its territory and is now found in more than 26 states. A new study by Smith and his colleagues based on data collected by the Institute of Medical and Entomology found that the species had settled in Lee and Des Moines counties in southeastern Iowa along the Mississippi River, and in Polk County in central Iowa. Suggests.This study was published in a peer-reviewed journal this week. Scientific Reports..

Disease vector

Aedes albopictus does not spread the West Nile virus, the most commonly transmitted disease by mosquitoes in Iowa. However, this species is a competent vector of the Zika virus, Chikungunya fever, and dengue virus, all of which can cause serious health problems in humans. Mr Smith said Iowa should be aware that the species appears to have settled in parts of the state, but the presence of the species should not cause panic.

These illnesses are rare in Iowa, and in most cases someone needs to get sick in the tropics where the virus is more common. The infected person then travels to Iowa, where the mosquito must be bitten by Aedes albopictus to infect other humans with the pathogen.

According to Smith, this is an unlikely sequence of events.

“Note that they are here, and they can spread,” Smith said. “Pay attention to the neglected material in the garden that may allow them to lay eggs.”

Mr Smith said Iowa may be able to notice Aedes albopictus with the naked eye. This species has a unique white racing stripe on its back to help distinguish it from other species common in the state. They tend to be most active at the end of summer.

Mosquitoes may have entered the three counties mentioned in the study on debris and other substances, including eggs, according to Smith. Mosquitoes lay eggs in landscapes that are dormant during the winter until warmer temperatures return. He said that Aedes albopictus eggs were likely unintentionally transported across the Mississippi River to Lee and Des Moines counties. This species seems to prefer urban and suburban environments to rural ones.It may suggest mosquito According to Smith, you can find structures in urban areas to help eggs survive the winter.

The Medical Entomology Laboratory uses a network of traps to monitor mosquito populations throughout the state and collect population samples. In 2016, the institute began an effort to track Aedes albopictus using traps in about 30 counties in Iowa.

According to Smith, the species appears to be established in only three counties, but the numbers are likely to increase over the next few years.

“It’s unclear exactly how fast and in which county it will expand, but it’s an issue we’re still following,” he said.

Researchers trying to strengthen mosquito surveillance

For more information:
David R. Hall et al, surveillance and genetic data, support the introduction and establishment of Aedes albopictus in Iowa, USA. Scientific Reports (2022). DOI: 10.1038 / s41598-022-06294-5

Quote: The mosquito surveillance program was obtained from on February 11, 2022 in three Iowa counties (2022). On February 11th), I discovered that the invading species had taken root.

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Mosquito surveillance programs have found that invasive species have become established in three counties in Iowa.

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