Fort Stevens State Park

Mosquito Control Program

Information about what is being done to help control mosquitoes around the Fort Stevens State park Campground.

Larval Control Pesticides Used

Bacillus thuringiensis serotype israelensis (Bti)

Bacillus sphaericus (Bs)

Spinosad (Natular XRT)

Monomolecular Films

How are pesticides applied?


When we treat catch basins or small sources, we usually apply by hand.

Backpack blower

Larger sources are treated with backpack blowers in order to spread the granular or liquid materials.


A lot of the time, pesticides will be applied from an All Terrain  Vehicle (ATV) or pickup truck.  

Our ATVs are equipped with equipment to spray both larvicides and adulticides.

Frequently Asked Questions

  1. Are pesticides applied to fish bearing waters?  No, pesticides will not be applied to fish bearing waters.  Natural predators take care of mosquito larvae in those sources.  We only apply the larivicides to mosquito larvae bearing water such as the seepage ditches between camp sites.
  2.  Are the applications of pesticides harmful?    No, the pesticides are not harmful to pets or people.  The larvicides used are specific to mosquito larvae. 
  3. Have a question for us? Please email the questions to

Treatment Schedule

No upcoming events.


Locating Mosquito Sources.

Drones are used to identify mosquito sources in areas not visible from the ground.

Then we utilize mosquito larvae dippers to identify mosquito larvae in standing water.

Adult Mosquito Control Pesticides Used

Aqualuer(r) 20-20

Esscentria IC3