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Overview, Mission & Vision
Mosquito and Forest Pest Management
Asian Tiger Mosquito
Emerald Ash Borer
Asian Longhorned Beetle
Sudden Oak Death
Thousand Cankers Disease of Black Walnut
Land and Site Development
Trash and Recycling
How Do I...
Problems in My Neighborhood
Illegal Dumping in Storm Drains
Mosquito & Forest Pest Concerns
Erosion, Flood or Drainage Concerns
Missing/Broken Street Name Signs
Compost, Mulch, Topsoil
Get Involved With
County Conference Rooms
Departments & Agencies
is now known as Mosquito and Forest Pest Management to reflect our full range of services.
The following spray blocks are scheduled to be sprayed this evening:
THE MOSQUITO SPRAY PROGRAM FOR THE 2014 SEASON HAS CONCLUDED.
The following spray blocks were sprayed last season:
July 11, 2014
2204, 2205, 2206
July 28, 2014
1407A, 1411, 1414A, 1511, 1512, 2105, 2106
July 30, 3014
1614, 2202, 2204
July 31, 2014
909, 1611, 1609
August 13, 2014
1614, 2202, 2208, 2210, 2211, 2220
August 14, 2014
404A, 408, 710, 906, 907
August 15, 2014
903, 904, 1407, 1409
August 19, 2014
909, 1511, 1512, 2105, 2106, 2205, 2206, 2207
August 21, 2014
August 28, 2014
404A, 404B, 701, 710, 2220
Spray Block Number
To find your spray block number, click
To hear recorded updates, call
(703-792-4636), then press '4', then '3'. This hotline is updated weekdays after
during the spray season.
The Prince William County Mosquito & Forest Pest Management Branch typically sprays for adult mosquitoes Monday through Friday throughout the mosquito season, and spray (
) is often done at night. There is no set schedule or order in which the blocks are sprayed. Rather, there are criteria established by the branch that trigger mosquito spray in a given area or neighborhood.
One trigger that could result in mosquito spray is based on surveillance trapping of adult mosquitoes. If a threshold number of female mosquitoes is met or exceeded on a given night, this can trigger mosquito spray for that trap area. Another trigger for mosquito spray is that the mosquitoes caught in a trap area test positive for
West Nile Virus
The ideal or most efficient form of mosquito control includes treating or larviciding immature mosquitoes in standing water.
mosquito spray is limited in its affect on adult mosquitoes.
The spray only affects adult mosquitoes that are out flying and come into contact with the spray at the moment it is being sprayed. The spray does not affect mosquitoes that are not active, at rest at night, or do not come into contact with the spray.
One of the most numerous and problematic mosquito species in Prince William County is not affected by spray, since it is inactive, or at rest during the evening and nighttime hours. That species is the
Asian Tiger Mosquito
. This species is among several found in the County that breeds in artificial or man-made containers, and is extremely difficult to control. You can help eliminate Asian Tiger Mosquitoes by making sure containers that hold a tablespoon or more of water are emptied or flushed out at least once a week.
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Prince William County Government