Press and Journal

Switch to desktop Register Login

Mosquito Spraying Mon., Aug.17 In Londonderry Twp.


Three areas in Londonderry Twp. are to be sprayed this Mon., Aug. 17 to control mosquitoes as part of Dauphin County’s West Nile Virus (WNV) Control Program.

The treatment of the insecticide will take place at 9 p.m. in the Cedar Manor, Pine Manor and Braeburn Park areas of the township. According to county officials, the treatments will be administered with ATV-mounted equipment that dispenses Biomist 3 + 15, a permethrin insecticide product, at a rate of 0.75 ounces per acre. usethispinecedarmanor“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,” according to a press release from the county announcing the spraying.

County officials also noted that residents who do not wish to have their properties sprayed should contact the WNV Control Program coordinator at (717) 921-8100 by 4 p.m. on Aug. 17.

A rain date for the application is Wed., Aug. 19.

Samples collected by the WNV Control Program have shown a high adult mosquito population carrying the virus. A total of 20 infected mosquito samples have been collected this summer in Dauphin County. Earlier this week infected samples were found in Conewago, Derry, East Hanover and Swatara townships. Three positive samples were collected in Londonderry Twp. County officials said the increase of positive samples in the county prompted the WNV Control Program to step up surveillance and spray for mosquitoes.Usethisbraeburnrd

County officials also noted residents may place their homes on a “no-spray” list. More information about the list is available by calling the County WNV Control Program at 717-921-8100.

The press release from the county listed the following frequently asked questions about mosquito control:

1.  Should toys and other items in the yard at the time of the application be washed?

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 swimming pools be covered before the application?

No, residue in a pool would be low and also diluted by the water in the pool.

3.  Should windows be closed and air conditioners turned off?

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 residents wait before a pet is permitted outdoors?    

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 residents wait before allowing children to enter a 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. 

Additional information about the program is available on the CDC’s Web site at and by calling the County’s WNV Control Program, call the Conservation District, (717) 921-8100.