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AGGRESSIVE FLOODWATER MOSQUITO

Dark Rice Field Mosquito

Psorophora ferox

Psorophora ferox is a substantial, aggressive mosquito associated with floodwater habitat. It is the kind of species that helps explain why wooded low areas can produce intense biting after rain.

BITE WINDOWDay / shade + dusk LARVAL HABITATShaded floodwater pools NJ PATTERNWarm wet periods
Dorsal illustration of Psorophora ferox mosquito
CDC PHIL #27769 · Illustration: Julius Chapman · Public domain
FAST FIELD READ

Large, dark, floodwater-linked and memorable when it bites.

The most useful homeowner clue is ecological rather than microscopic: this is a floodwater Psorophora associated with temporary shaded pools and wet woodland habitat. CDC provides a dorsal illustration for morphology.

HOMEOWNER ID CONFIDENCEModerate with size + morphology

A large robust mosquito may suggest Psorophora, but exact species confirmation still requires good morphology.

01

Adult appearance

CDC illustration shows the robust dark body and patterned scaling typical of Psorophora ferox. It is visually more substantial than many small house mosquitoes.

02

Floodwater habitat

Eggs of floodwater mosquitoes persist in soil and hatch when water returns. Psorophora ferox is commonly associated with shaded temporary pools and woodland flooding.

03

Biting behavior

Psorophora are known as aggressive biters, and ferox can be active in shaded conditions during the day as well as around crepuscular periods.

04

Why weather matters

Repeated flooding can create successive broods, so a wet summer may produce strong pressure even where artificial containers are well managed.

05

Source distance

Adults can move away from larval habitat; a wooded flood site or low area outside the property can contribute to yard pressure.

06

Homeowner response

Inspect local low areas, but recognize when the pattern is regional. County mosquito-control data can help separate a private source problem from a floodwater event.

DON’T CONFUSE IT WITH…

Aedes vexans

Both are floodwater mosquitoes. Aedes vexans is a classic widespread regional nuisance species; Psorophora ferox is larger and more robust, often associated with shaded wooded flood habitat.

COMMON QUESTIONS

Identification questions

Is Psorophora ferox a container mosquito?

Its characteristic ecology is floodwater habitat rather than ordinary household containers.

Can it bite during the day?

Yes, especially in shaded habitat.

Does one wet low spot matter?

Temporary flooded ground can matter greatly when eggs are already present in the soil.

PRIMARY IDENTIFICATION SOURCES

Species profile grounded in Rutgers and CDC resources.

Species accounts are summarized for homeowners; the linked entomology resources contain the technical morphology and surveillance context.

FOUND THE MOSQUITO. NOW FIX THE YARD.

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