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.
Naturally-occurring soil bacterium that targets mosquito larvae
Contains insect growth regulator that halts the mosquitoes from developing in the water. Target-specific to mosquitoes.
Surface film oil
Prevents larvae and pupae from breathing
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.
Derived from chrysanthemum flowers
Highly effective at controlling mosquito populations
For more information, visit npic.orst.edu/
Frequently Asked Questions
The District controls mosquitoes through an Integrated Vector Management (IVM) approach whereby various factors are taken into consideration which direct decisions as to the best approach for any given situation including: source reduction and habitat management, larval control, adult control, and public education.
The decision to control adult mosquitoes can be triggered by various factors including: current mosquito populations, VBD indicators (positive mosquitoes, birds, chickens, humans etc.), temperature and other environmental factors, challenges controlling transmission with other methods, etc.
We will conduct aerial adult mosquito control if conditions are warranted in our area. Our first priority is protecting public health, and will use this approach, if necessary.
The active ingredients in the pesticides used for aerial mosquito control are products commonly found in many over-the-counter insecticides available to the general public. Aerial applications actually use less pesticide than is commonly used around the home because aerial equipment disperses much smaller droplets to better target mosquitoes.
The decision to conduct adult/aerial mosquito control is never taken lightly. The products are less specific and can impact non-target species, therefore will only be conducted when public health is threatened and other means have not been adequate to reduce these risks.