HomeMy WebLinkAboutMemo - Mail Packet - 9/6/2022 - Memorandum From Matt Parker And Amy Resseguie Re: West Nile Virus (Wnv) - Larimer County Spray Recommendation 1745 Hoffman Mill Road
PO Box 580, Fort Collins, CO 80522-0580
MEMORANDUM
Date: August 30, 2022
To: Mayor and City Councilmembers
From: Matt Parker, Sr. Supervisor, Natural Areas
Amy Resseguie, Lead Specialist, Communications & Public Involvement
Through: Kelly DiMartino, City Manager
Tyler Marr, Interim Deputy City Manager
Seve Ghose, Director, Community Services
Mike Calhoon, Director, Parks
Katie Donahue, Director, Natural Areas
Ginny Sawyer, Sr. Project Manager
Subject: West Nile virus (WNV) – Larimer County Spray Recommendation
Summary:
The Larimer County Department of Health and Environment is recommending a third mosquito
treatment application. The recommended treatment area is between Drake Rd. and Harmony
Rd., from Overland Trail Rd. on the west to Ziegler Rd. on the east (map attached). The vector
index value for this area is 0.94. Although it is typical for decreasing overnight temperatures to
drive mosquito populations downward at this point in the season, abundance numbers are
currently 4x the historic average citywide, with the southwest quadrant experiencing a 7x
increase over historic average.
Based on the recommendation, a treatment will take place on Thursday, September 1 and
Tuesday, September 6.
Current Vector Index:
Week No: 34 Vector Index
Threshold:
Previous Week Vector
Index:
Current Vector
Index:
FC – Zone NW NA 0.11 0.18
FC – Zone NE NA 0.80 0.69
FC – Zone SE NA 0.33 0.28
FC – Zone SW NA 0.09 0.55
FC – Citywide NA 0.35 0.47
Floating Zone 0.75 1.00 0.94
DocuSign Envelope ID: 3952EEC3-C97C-4244-ADD9-E1FCC56E7CAD
City of Fort Collins
Current Conditions: Seventeen trap locations tested positive across the city; however, five
positive traps are in the northeast quadrant. Much of the northeast quadrant was treated last
week and data, having been collected prior to the treatment, was not considered in the current
calculation of vector index values. While city-wide, infection rates are slightly below historic
average for this time of year, the southwest quadrant shows infection rates at twice the historic
average. Meanwhile, higher abundance than typical in all areas continues to drive vector index
values.
Process for Spray Recommendations: Current WNV conditions exceed the policy thresholds
identified for adult mosquito spraying applications. When the City’s trapping network shows
WNV activity beyond the threshold of 0.75, the LCDHE makes a recommendation that the City
conduct an application to treat adult mosquitoes. When an application is recommended, areas
of concern will be identified based on data from a minimum of 5 traps. Identified treatment areas
may be sub-zone or may cross zone boundaries.
Outreach and Public Awareness:
With this recent recommendation from the County Health Department, additional communication
will take place, including phone, email and text notifications sent to those who have signed up to
receive such notices. Spray notifications and other outreach materials are shared in both
English and Spanish.
West Nile awareness advertising and other public outreach is scheduled to continue through the
Labor Day holiday before concluding for the season. Outreach information is centered on “4Ds”
messaging, which encourages people to Drain standing water, Dress in long pants and sleeves
to deter biting, Defend with EPA-approved repellant, and avoid the high mosquito activity time
between Dusk & Dawn.
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DocuSign Envelope ID: 3952EEC3-C97C-4244-ADD9-E1FCC56E7CAD
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City of Fort Collins GIS
²
West Nile Virus - City of Fort Collins
Mosquito Spraying
Thursday, September 1 and Tuesday, September 6
0 1 2½
Miles
Drake Rd.
Harmony Rd.S. College Ave.DocuSign Envelope ID: 3952EEC3-C97C-4244-ADD9-E1FCC56E7CAD