As part of our Integrated Vector Management (IVM) strategy, we always attempt to physically remove the source of mosquito breeding. That’s why we always say “Get rid of stagnant water!”

However, when physical control isn’t possible or if there is a serious and immediate threat to public health, we will use pesticides to eliminate the public health threat. This  environmentally-sensitive approach poses minimal risk to humans, animals, and the environment.

Fighting Larvae and Pupae

It’s easier to control mosquitoes when they’re in the water. A majority of our pesticide use is on mosquito larvae and pupae. Tackling mosquitoes in standing water is extremely effective using the following materials.

B.t.i. (Bacillus thuringiensis) and B.s. (Bacillus sphaericus)

Naturally-occurring soil bacterium that targets mosquito larvae

Commonly Used:
Fourstar BTI
Vectobac
Vectolex

Methoprene

Contains insect growth regulator that halts the mosquitoes from developing in the water. Target-specific to mosquitoes.

Commonly Used:
Altosid
Dimilin 25 WP

Spinosad

Naturally-occurring bacterium

Commonly Used:
Natular

Surface film oil

Prevents larvae and pupae from breathing

Commonly Used:
CocoBear
Masterline Kontrol
BVA

Mosquitofish

These hardy fish will gobble up mosquito larvae and pupae in your pond and fountain. Get mosquitofish from vector control

Fighting Adult Mosquitoes

It is more difficult to control mosquitoes when they’re flying, but tools are available to control a mosquito infestation or disease outbreaks. These materials target the adult  mosquitoes (adulticides). Most applications of adulticides use less than 1 fl. oz. (2 tbsp) per acre. They’re dispersed in diluted amounts as ultra-fine droplets, which break down to harmless ingredients very quickly in the environment.

Pyrethroid and Pyrethrin

Derived from chrysanthemum flowers

Commonly Used:
Duet
Zenivex

Organophosphates

Highly effective at controlling mosquito populations

Commonly Used:
Nuvan strips

For more information, visit npic.orst.edu/

Frequently Asked Questions