Updated 7/13/12 at 5 p.m. to add information about last year's spray and potential safety concerns.
The Montgomery County Health Department will spray the adult mosquito population in Wynnewood next week, according to a Montgomery County press release. The spraying follows four positive cases of West Nile Virus found in Wynnewood and Penn Wynne mosquitoes in the past month.
The spraying will occur in residential areas within the boundary of Remington Road, East Lancaster Avenue, City Line Avenue and Haverford Road, on July 17 between 8:15 and 11 p.m., weather permitting. A rain date is set for July 18. The spraying will not be done by Lankenau Hospital nor by any schools, Montgomery County Communications Director Frank Custer said.
There will be no aerial spraying, according to the release. Health Department employees will use a truck mounted with an Ultra Low Volume (ULV) sprayer.
According to Custer, two sprays were conducted in Lower Merion last year—one at the Lower Merion Recycling Center on Aug. 9 and the other Aug. 31 on River Road.
Following the sprays, there was one mosquito found that tested positive for West Nile Virus, but no positives were reported in the area of the second spray after it was performed, Custer said.
When asked if the sprays were harmful, Custer, as suggested by the Health Department, provided a link to this informational page about the sprays. It reads in part:
USEPA has evaluated these chemicals for this use and they have been found to pose very little risk to human health and the environment when used according to label directions. Exposure to the spray may aggravate existing respiratory conditions or affect sensitive individuals. Pyrethroids that enter the body leave quickly, mainly in the urine, but also in feces and breath.
Persons who apply pyrethroids and are accidentally exposed to very large amounts of these chemicals may experience dizziness, headache, nausea and diarrhea. Children exposed to large amounts of pyrethroids would be expected to be affected in the same way as adults. Adverse health effects would not be expected when pyrethroids are used according to label directions.
There is no evidence that pyrethroids cause birth defects in humans or affect the ability of humans to have children. Pyrethroids do not cause cancer in people.
According to Custer, the main way to reduce exposure to the chemicals is to stay indoors during spraying and for about 30 minutes afterwards.
"Generally, there is no need to leave the area during mosquito control spraying," Custer said.
According to the release:
The Health Department will work with appropriate agencies to identify, eliminate or treat with larvacide, areas where mosquitoes are breeding.
Residents may contact the Health Department at 610-278-5117 if they are concerned about an area of standing water that may be a breeding area. The adult mosquito control program will only be used in limited situations to reduce large numbers of adult mosquitoes.
- Test Finds Lower Merion's 4th West Nile Virus Case In Penn Wynne (July 11, 2012)
- Third Case of West Nile Found in Lower Merion (July 10, 2012)
- Symptoms and Treatment of West Nile Virus (June 26, 2012)
- Tips for Avoiding West Nile This Summer (June 25, 2012)
- Second Case of West Nile Found in Wynnewood (June 25, 2012)
- West Nile Virus Found in Wynnewood Mosquitoes (June 22, 2012)