The Delaware County Health Department’s (DCHD) Mosquito-Borne Disease Control
Program will conduct an Ultra-Low Volume (ULV) mosquito adulticide spray in sections of
Upper Chichester, Aston, and Brookhaven on August 10th , 2023. Residential and recreational
areas within the treatment zone will be treated to control adult mosquitoes. This is a result of
high trap counts and the identification of positive mosquito pools containing West Nile Virus in
the area.
Treatment will take place during the evening of Thursday August 10th , 2023, starting at
approximately 8:00 pm and concluding by 11:30 pm if weather and environmental conditions
remain suitable for the operation. In the event of weather or other unexpected delays, a rain
date is scheduled for Monday August 14th , 2023.
West Nile virus is an infection that is spread by infected mosquitoes biting humans that
can cause neurologic symptoms. Many people who are infected with West Nile virus do not
develop symptoms, however, one in five people infected will develop flu-like symptoms and
fever. Unexplained headaches, weakness, and fatigue are symptoms of West Nile virus and
those who experience these symptoms should reach out to their primary care provider.

The Delaware County Health Department will perform the treatment using truck-
mounted spraying equipment. The product used will be Duet Dual Action adulticide, applied at
a rate of 0.64 ounces per acre, designed to provide quick and effective control of adult
mosquitoes. For resident safety and information, the business license ‘BU13865’ will be visible
on department equipment.
Individuals are encouraged to take personal protection measures to avoid getting bitten
by mosquitoes. To protect themselves and to help prevent the spread of West Nile virus,
residents are also encouraged to remember the ‘Three D’s’:

• DRAIN - Buckets, flowerpots, pet water dishes, clogged rain gutters, and other sources of standing water outside your home
• DRESS -Wear long-sleeved shirts and long pants when you are outdoors, weather permitting
• DEFEND- Wear insect repellent with DEET, Picaridin, or Oil of Lemon
• Eucalyptus on exposed skin when outdoors