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Mosquito Spraying - CANCELED
UPDATE - TUESDAY, SEPT. 10: The City of Fort Collins and Larimer County Department of Health and Environment have CANCELED the mosquito spraying scheduled for Wednesday, Sept. 11.
The latest trap data analyzed on Monday shows a considerable decline in the West Nile virus vector index, and therefore a decline in the public health risk.
The decision to cancel Wednesday’s spray operations follows the recommendation by the Larimer County Department of Health and Environment, in accordance with the City’s West Nile Virus Management Policy.
UPDATE - MONDAY, SEPT. 9: Due to inclement weather on Sunday, Sept. 8, spray operations could not be completed in the entire spray zone. Approximately 1/3 of the total zone was treated on Sunday. Click to view a map of the areas that were completed.
The entire spray area will be treated on Wednesday, Sept. 11; any additional treatment of the areas missed on Sunday is yet to be determined.
Based on high levels of West Nile virus infected Culex mosquitoes trapped last week, the City of Fort Collins and the Larimer County Department of Health and Environment will spray for mosquitoes in central and north Fort Collins and adjacent Larimer County.
Spraying will occur by fogging trucks on both Sunday, Sept. 8 and Wednesday, Sept. 11, weather permitting; it will begin at 8 p.m. each night and end by 2 a.m. the following morning.
The entire spray area will be treated on both nights.
GPS Truck Map: Follow the progress of the fogging trucks while spraying occurs Sept. 8 & 11.
Weekly Vector Index
Recommendations to spray for adult mosquitoes are made by the Larimer County Health Department, and are based on data from at least a 5-trap area that has a vector index of 0.75 or higher. The City operates a network of 53 traps providing weekly data on the level of WNV in targeted areas.
WNV vector index levels updated weekly, June 17 through September 16, 2019.
Last updated: September 16, 2019. Next scheduled update: June 2020
VECTOR INDEX (map of quadrants):
NW Quadrant: 0.00
NE Quadrant: 0.00
SE Quadrant: 0.04
SW Quadrant: 0.00
PLEASE NOTE: In order to best target infected mosquitoes, treatment zones are based on current data and are often different, smaller, or may cross quadrants.
Mosquitoes don’t respect quadrant boundaries. Vector index values for quadrants are provided to help residents understand a consistent measure of risk throughout the season and over time.
While the vector index for an entire quadrant may be less than 0.75, it is very possible that areas of smaller or different geographical makeup exceed 0.75. Any area of 5 traps or more may become a treatment area regardless of how or where it fits into the quadrants.
When determining treatment areas, the goals are as follows:
- Be effective, responsible, and judicious with pesticides
- Target as small an area as possible
- Target as early as is reasonable to limit viral amplification
- Treatment areas must be at least 5 traps in size to be statistically valid
Interested in how the Vector Index is calculated? Find more information from the Centers of Disease Control here.
Most recent three week's trap data:
Protect Yourself with the Four D's!
- Drain: Mosquitoes breed in water! Drain any standing water in your yard each week. Bird baths, clogged gutters, and kiddie pools are common breeding sites.
- Dress: Wear lightweight, long-sleeved shirts and long pants while outdoors. Spray clothing with insect repellent since mosquitoes may bite through clothing.
- Defend: Apply insect repellent sparingly to exposed skin. Use an approved repellent according to its label. Find the repellent that is right for you.
- Dawn/Dusk: Limit time spent outdoors at dusk through dawn, when mosquitoes are most active and feeding.
LETA WNV Spraying Alerts
In the event that the City of Fort Collins decides to spray for mosquitoes, you can sign up for community alerts at Larimer Emergency Telephone Authority (LETA911).
Email or Phone Call Alerts: Create an account and under "My Alert Subscriptions" click "Community Alerts" and then check the "Fort Collins | Poudre Fire Authority" box and check "West Nile Virus Spraying" to receive alerts.
Text Alerts: To receive a text message alert, simply text FCWNV to 888-777.
LETA911 is the Governing Authority for 9-1-1 in Larimer County, Colorado. LETA911 provides oversight to 9-1-1, the equipment, and the programs funded by LETA. This includes non-emergency or community alerts for WNV adulticiding.
New Interactive Mosquito Surveillance & Control Map
Our mosquito control contractor, Vector Disease Control International, has a NEW interactive mosquito surveillance and control map.
Businesses Can Apply To Opt Out Of Spraying
If you are a business or laboratory you can apply to opt out of our adulticiding (spraying operations). Please keep in mind only commercial businesses able to prove a long-term negative financial impact on their business will be considered. To apply, enter your business and contact information. Applicants will receive an application via email with the requirements and details of the opt-out.
West Nile Virus Technical Advisory Committee
The West Nile Virus Technical Advisory Committee meets to discuss the previous mosquito season and considers recommendations for future response guidelines. The committee is composed of City-appointed experts who provide technical expertise and make recommendations to City Council regarding the City’s West Nile Virus Management Policy. Visit their webpage for meeting minutes and to get notifications when new minutes are available.
- January 15, 2020
- February 19, 2020
- March 18, 2020
- April 15, 2020
Meetings are held from 4:30 - 6:00 PM in the Parks Department Conference Room, 413 S. Bryan Ave.