HomeMy WebLinkAboutMemo - Read Before Packet - 7/25/2023 - Memorandum From Matt Parker And Amy Resseguie Re: West Nile Virus (Wnv) – Recommended Adult Mosquito TreatmentCity of
„,F`rt Collins
Natural
Areas
1745 Hoffman Mill Road
PO Box 580, Fort Collins, CO 80522-0580
MEMORANDUM
Date: July 25, 2023
To: Mayor and City Councilmembers
From: Matt Parker, Sr. Supervisor, Natural Areas
Amy Resseguie, Lead Specialist, Communications & Public Involvement
Through: Tyler Marr, Deputy City Manager
Dean Klingner, Director, Community rvices
Mike Calhoon, Director, Parks
Katie Donahue, Director, Natural Areas
Subject: West Nile virus (WNV) — Recommended Adult Mosquito Treatment
Summary:
The Larimer County Department of Health and Environment is recommending the City of
Fort Collins spray for mosquitoes in the northeast quadrant on Sunday, July 30. The
recommended spray area carries a vector index of 1.23, exceeding the policy threshold of 0.75,
and conforms with the City's policies for mosquito spraying.
Current Vector Index:
Week No: 29
Vector Index
Threshold:
Previous Week Vector
Index:
Current Vector
Index:
FC — Zone NW
NA
0.09
0.39
FC — Zone NE
NA
0.10
1.23
FC — Zone SE
NA
0.74
0.86
FC — Zone SW
NA
0.04
0.79
FC — Citywide
NA
0.36
0.86
Floating Zone
0.75
0.76
1.23
Current Conditions: While last week's data showed 12 WNV-positive traps, this week's data
includes 22 positive traps. Two key points highlight this week's data: first, a strong increasing
Vector Index (VI) trend continues and second, nearly all the trap data from the southern
quadrants reflects conditions prior to the Sunday, July 23 application and therefore is not
informative as a data point for this week's application.
An additional and very significant consideration is the strain placed on regional mosquito
management services with the widespread WNV risk throughout the Northern Colorado area.
The recommendation from the Larimer County Department of Health and Environment includes
modifications accounting for the limited resources. The zone is smaller than would be otherwise
recommended and once again, the recommendation indicates a single night application. When
all traps in the northern quadrants are included, the VI for that area is .83, which exceeds the
policy threshold. Given the limited mosquito management resources and the higher VI in the NE
traps, the recommendation is to focus on that quadrant as it is the area of greatest risk.
Process for Spray Recommendations: When the City's trapping network shows WNV activity
beyond the threshold of 0.75, the Larimer County Department of Health and Environment
(LCDHE) makes a recommendation that the City conduct an application to treat adult
mosquitoes. When an application is recommended, areas of concern are 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:
Phone, email, and text notifications will be issued on Tuesday to all individuals signed up to
receive such notifications through Larimer Emergency Telephone Authority. A press release will
be issued, and information will be shared through social media. Webpage content will be
updated with the latest vector index values and a map of the planned spray area. All key
communications are shared in English and Spanish.
Throughout the West Nile Virus season, general outreach and education 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. Messaging also encourages community members to opt -in
to receive notification about any future spray events.
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City of Fort Collins
MOSOUfl..
SPRAYING MAI
Sunday, July 30, 2023 Sprayed areas
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Week Ending Date: 7/23/2023
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