Update: Fort Collins cancels mosquito spraying plans

Samantha Ye

Fort Collins has canceled mosquito spraying set for tomorrow night, according to a City news release

Recent trapping data from Monday shows a significant decline in the West Nile virus vector index, from 0.70 on Sept. 3 down to 0.27 on Sept. 9. The vector index reflects the proportion of mosquitoes trapped per night infected with the virus.


When the index falls, so does the public health risk posed, according to the release. As such, the pesticide spraying set for Sept.11 has been canceled, following the recommendation by the Larimer County Department of Health and Environment, in accordance with the City’s West Nile Virus Management Policy.

Two sprayings were set to occur last Sunday, Sept. 8, and tomorrow night. 

The Sunday spraying was only partially completed due to inclement weather, according to the City. They treated about one-third of the total area. Originally, the spraying would have covered north and central Fort Collins, including Colorado State University campus, but the University was ultimately not treated. 

Samantha Ye can be reached at news@collegian.com or on Twitter @samxye4.