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 September 01, 2017 - Dauphin County Mosquito-Borne Disease Control Program to spray for mosquitoes in a portion of Susquehanna Township

HARRISBURG, PA (September 1, 2017) – Dauphin County’s Mosquito-Borne Disease Control Program staff will apply treatments at 8 p.m. on Wednesday, Sept. 6 in a portion of Susquehanna Township to control the adult mosquito population and the spread of West Nile Virus (WNV). Although no human cases of WNV have been reported in Dauphin County, a total of 99 mosquito samples have tested positive for the virus.

Samples collected by the Mosquito-Borne Disease Control Program have shown a high adult mosquito population carrying the virus. Infected samples have been collected this summer in the following municipalities in Dauphin County: City of Harrisburg, East Hanover Township, Derry Township, Halifax Township, Highspire Borough, Londonderry Township, Lower Paxton Township, Lykens Borough, Millersburg Borough, Paxtang Borough, South Hanover Township, Steelton Borough, Susquehanna Township, Swatara Township, Washington Township, West Hanover Township, and Wiconisco Township.

The treatments will be administered using ATV-mounted equipment to spray in the areas around Fort Hunter Park and Fort Hunter Road. The equipment dispenses Biomist 3 + 15, a permethrin insecticide product, at a rate of 0.75 ounces per acre. This is a very low concentration of a pesticide that has been tested and approved by the United States Environmental Protection Agency for use in controlling adult mosquito populations in and around people.

Frequently asked questions about mosquito control:

1.  Should I wash toys and other items in the yard at the time of the application?
It is not necessary to wash items in your yard after the application.  Due to low application rates, any exposure from contact with these surfaces would be low and pose negligible risks.


2.  Should I cover the pool before the application?
No, residue in a pool would be low and also diluted by the water in the pool.
3.  Should I close the windows and turn off my air conditioner?
The ULV vapor disperses readily, and little movement of the material into open windows with screens is expected.  However, individuals with upper respiratory problems, such as asthma, may react to ULV applications.  Closing windows and turning off air conditioners is recommended for those with upper respiratory problems. 


 4.  How long should I wait before I let my pet out?    
When the chemical is applied at the labeled rates, there are wide margins of safety for humans, dogs, cats and other mammals.  Indoor pets may be "let out" immediately following the application.  Outdoor pets may be left outdoors.


5.  How long should I wait before allowing the children to enter the yard?
The ULV vapor disperses very quickly after the application.  Individuals with respiratory problems may react to ULV application.  People with these health issues may want to wait an hour before resuming outdoor activities in treated areas. 


6. How do I get on your “no-spray” list?
Please call the Dauphin County Mosquito-Borne Disease Control Program at 717-921-8100 to be placed on the list.
To learn more about WNV and prevention, visit the CDC’s Web site at  For more information about the county’s program, call the Conservation District at 717-921-8100.

Category: Dauphin County
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