Mosquito Control Safety Update
The issues of West Nile virus prevention and an emergency mosquito control policy are often controversial. The Town of Berthoud is very concerned about protecting its residents from potential infection and also sensitive to the worries some may have regarding mosquito control.
Berthoud has partnerships with Colorado State University, the Larimer County Department of Health, and Vector Disease Control International to address the problems of both the West Nile Virus and emergency mosquito control measures.
Helpful links to navigate this page:
- Official Resolution and policy >>
- West Nile Virus >>
- Mosquito Control Policy >>
- Learning more/resources >>
- Town of Berthoud WNV Education Plan >>
- Town of Berthoud WNV Communication Plan >>
Introduction to West Nile Virus
West Nile is a serious, sometimes fatal, virus that has been found in Larimer County consistently over the past decade. The virus is transmitted by mosquitoes who bite infected birds and then spread that infection to humans and other animals.
There are no vaccines or treatments for the virus, so the best way to ensure safety is to prevent yourself from being bitten by mosquitoes.
If everyone takes preventative measures, the need for activating our control policies will be reduced.
The basics of West Nile prevention include:
- Drain or dump standing water
- Dress appropriately (long, loose-fitting clothing)
- Defend yourself with insect repellant
- Be aware at dawn and dusk, when mosquitoes are most active
Other preventative measures:
- Stay clear of long grasses, wetlands, shrubs and grassy shores
- Repair window and door screens to prevent mosquitoes from entering your home
- Trim bushes away from the ground to allow for air flow and reduction of dampness
- Leave dead birds where you find them and call 1.877.462.2911
Town of Berthoud Mosquito Control Policy
To mitigate the potential effects of West Nile virus on residents, the Town of Berthoud adopted Resolution 16-15 regarding mosquito control spraying in July of 2015. This resolution was updated in June of 2017.Vector Disease Control International (VDCI) is the Town's contractor for mosquito control measures. Their role includes treating mosquitoes at the larval stage, trapping mosquitoes and sending for testing at CSU, and activating emergency control measures if necessary.
VDCI will devote the majority of its staff and resources to eliminating larval activity for the Town of Berthoud. Larvicide measures include treating standing water for the incidence of mosquito larvae prior to maturation into full adults. It is an important control method because it reduces the overall mosquito population. See map below for larvicide boundary areas.
The Town of Berthoud uses a metric called a Vector Index (VI) to determine when to trigger adult mosquito control measures. If the WNV disease is present, it's imperative to stop the disease cycle as quickly as possible to ensure public safety.
In simple language, a Vector Index is is a number calculated by combining measures of the abundance of Culex mosquitoes (the species that carries WNV) and the rate of infection in those mosquitoes.
In conjunction with Larimer County, the Town of Berthoud has adopted a VI trigger of 0.5 to commence adult control measures.
Mosquito Control Measures
The process for activating adult mosquito control in the Town of Berthoud is as follows:
- Vector Disease Control International (VDCI) places four traps in town and collects mosquitoes in those traps weekly
- Traps are sent to Colorado State University to determine the presence of WNV in these traps
- If the Vector Index (VI) is over 0.5 when averaged between all four traps, adult control operations will commence
- A minimum of 48 hours notice will be given to the residents
- City-wide control measures will take place over two consecutive days after 10 p.m., weather permitting
Please note: Residents must opt in to be notified about control measures.
More information on how to opt in will be released shortly.
- Town of Berthoud VDCI contract >>
- Product label for mosquito control application >>
- Data sheet for mosquito control application >>
- American Mosquito Control Association: http://www.mosquito.org/mosquito-borne-diseases#WNV
- Centers for Disease Control: https://www.cdc.gov/westnile/index.html
- State of Colorado: https://www.colorado.gov/pacific/cdphe/west-nile-virus
- Larimer County: http://www.larimer.org/health/cd/westnile-about.cfm
- Colorado State University: http://extension.colostate.edu/mosquito-management/
- Town of Berthoud: http://www.berthoud.org/residents/moquito-spraying-and-west-nile
- Fight the Bite: http://www.fightthebitecolorado.com/index.htm
- Vector Disease Control: http://www.vdci.net/
2017 Trap Data