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Researcher: This could be 'very big year' for mosquitoes

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NORMAL — Mosquitoes.


If you're already starting to itch, you are probably wondering if all our recent rain means a bumper crop of bugs.

The good news is you don't have to worry — yet.

“Mosquito populations need at least a week with temperatures above 50 degrees to actually start appearing,” said Kelly Allsup, horticulture educator with the University of Illinois Extension.


Illinois State University professor Steven Juliano examines mosquitoes stored in his laboratory at Felmley Hall Annex. The mosquito is a known vector among healthcare workers for carrying a variety of diseases that can be spread to humans.

However, while the temperatures have been dipping into the mid-40s at night recently, Steven Juliano, a distinguished professor of ecology at Illinois State University who studies mosquitoes, said, “The cold hasn't been cold enough to knock it back,” just slow it down.

In fact, “there are indications this could be a very big year,” said Juliano. “I wouldn't be surprised with all of the rain we've had, it's going to be a good year for mosquitoes — or a bad one, depending how you look at it.”

Carol Carlton of the Macon County Health Department said, "We say the season is May 15 to Oct. 15, but the mosquitoes don't know that."

And don't forget the ticks, which are already showing up and can carry Lyme disease.

“They like the moist, cool weather,” said Allsup.


A mosquito looks for its next meal in Illinois State University professor Steven Juliano's laboratory at Felmley Hall Annex.

Our wet spring is likely to produce “lots of lush growth” that the ticks enjoy, she warned.

Both ticks and mosquitoes can carry diseases.

Jill Wallace, environmental educator at Sugar Grove Nature Center at Funks Grove, said some children in her classes are afraid to go outside when they hear about ticks and other bugs.

“I tell them, 'They're nothing to be afraid of, just something to be aware of,'” said Wallace.

Juliano said, “Personal protection is the thing you have the most control over.”


Several colonies of mosquitoes are stored in growing cabinets in the laboratory.

The Illinois Department of Public Health recommends using repellents containing DEET, picardin or oil of lemon eucalyptus.

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“The biggest thing you can do is remove items that hold water,” said Tom Anderson, director of public health for the McLean County Health Department.” He noted that the "culex pipiens," or house mosquito, which carries West Nile virus, “loves stagnant water.”

It doesn't take much water for mosquitoes to breed. Places where water collects include flower pots, bird baths, dog bowls and gutters, said Carlton.

Other problem areas can be old tires, kiddie pools and children's toys left outside, such as sand pails, said Anderson.

Juliano said the Asian tiger mosquitoes, once considered a southern variety, can be found in Bloomington-Normal, Decatur, Champaign and Springfield.


Illinois State University professor Steven Juliano grows a variety of mosquito larvae in his laboratory at Felmley Hall Annex.

Jason Probst, field operations manager for the Macon County Mosquito Abatement District, said the “silver lining” from the recent rainy weather is that it “gives us an indication of what may be good breeding spots” where stagnant water collects.

Probst said “take care of them now” and be aware of them later.

Juliano is in the midst of a multiyear study on strategies for mosquito control.

One thing he has found during the research is that if you kill a certain percentage of larvae, but not all of them, those that survive will be “higher quality survivors,” said Juliano. He has compared it to what happens if you plant seeds and the number that sprout are so numerous that they crowd each other out competing for resources, but if you thin them out, the surviving plants grow bigger and stronger.

Different species in different locations have different responses, and Juliano and his team of researchers are trying to help those involved in mosquito control with information to refine their methods of attack.

For now, entities such as the Macon County Mosquito Abatement District use what Probst called an “integrated pest management approach.”

That starts with educating people to get rid of potential breeding areas.

“The most work we're engaged in is larval control,” said Probst. “They're captive. They're not going anywhere.”

The district uses a larvacide called Bti that's a naturally occurring bacteria that “is not harmful to other aquatic life,” he said. For mosquitoes in the pupal state, the district uses a larvicidal oil called CocoBear.

Bti is also available for residential use in places such as ornamental ponds and rain barrels which cannot be emptied out or turned over every week.

When mosquitoes in traps test positive for mosquitoes or when there is a lot of rain in warmer weather that would prompt nuisance mosquitoes to hatch, the district uses an ultra low volume sprayer/fogger with permethrin to go after adult mosquitoes, he said.

The substance is water-based and about a half cup of the active ingredient covers an area the size of two football fields, said Probst.

McLean County does not have a mosquito abatement district, but several communities are involved in mosquito control, said Anderson. The McLean County Health Department has mosquito traps throughout the county which it checks twice a week. The batches of mosquitoes are tested for West Nile virus.

Last year, 176 human cases of West Nile virus were reported in Illinois, resulting in 17 deaths.

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Contact Lenore Sobota at (309) 820-3240. Follow her on Twitter: @Pg_Sobota


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