APPENDIX II-BV: LARVICIDING ONLY,--NO SPRAYING OF PESTICIDES--in the City of Boulder Leads to NO Mosquitoes Positive to West

APPENDIX II-BV: LARVICIDING ONLY,--NO SPRAYING OF PESTICIDES--in the City of Boulder Leads to NO Mosquitoes Positive to West Nile Virus. Friday, August 10, 2007.

Date: Fri, 10 Aug 2007 15:06:00 ‑0600

From: rmpjc <rmpjc@earthlink.net>

To: susan l gold <susanlgold@yahoo.com>,

anne lee maziar <anne.maziar@colorado.edu>,

kirsten burris <kirsten.burris@frontrange.edu>,

brandon lundell <brandonlundell@juno.com>, uma bacso <umabacso@indra.com>,

jen sutton <jensutton2@juno.com>, elsie klassen <asliimp@comcast.net>,

barb patton <barbpatton@earthlink.net>, marc osborne <marcovlt@indra.com>,

tom moore <trmoore@comcast.net>,

Tim Seastedt <Timothy.Seastedt@colorado.edu>,

stephanie clark <sclark1024@comcast.net>, randy weiner <ecolaw@Bsuites.com>,

Mary Louise Chavers <kushi80306@yahoo.com>,

marty walter <walter@boulder.colorado.edu>,

kirk cunningham <kmcunnin@juno.com>,

kathleen christensen <kathjackrose@comcast.net>,

jim morris <jim@jimmorris.com>, jill sverdlove <jsverdlove@aol.com>,

cosima krueger <cardamomseed@aol.com>,

caitlin waddick <cwaddick@mindspring.com>, betty ball <rmpjc@earthlink.net>,

angela medbery <a.medbery@juno.com>

Subject: Fw: Weekly West Nile Virus Update‑August 10, 2007

Parts/Attachments:

1 OK ~157 lines Text (charset: ISO‑8859‑1)

2 Shown ~883 lines Text (charset: ISO‑8859‑1)

‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑‑

‑‑‑‑‑ Original Message ‑‑‑‑‑ From: Jonathan Koehn

To: Kevin Afflerbaugh ; Kathleen Alexander ; Andrew Bascue ; Don Damico ;

Yael Gichon ; Alice Guthrie ; Jonathan Koehn ; Joy Master ; Kara Mertz ;

Sean Metrick ; Shireen Miller ; Dean Paschall ; Beth Powell ; Sarah Van

Pelt ; Elizabeth Vasatka ; rmpjc

Sent: Friday, August 10, 2007 12:35 PM

Subject: Fwd: Weekly West Nile Virus Update‑August 10, 2007

Jonathan Koehn

Environmental Affairs Manager

City of Boulder

303‑441‑1915

koehnj@bouldercolorado.gov

>>> Jonathan Koehn 8/10/2007 12:34 PM >>>

Hello Council Members,

Here is the update for the trapping week of August 7, 2007.

Summary

Starting with the good news, mosquito samples submitted from the city of

Boulder last week were again negative for the presence of WNV. The CDPHE

is now reporting 28 positive mosquito pools from Boulder County; positives

have been reported throughout the county but the majority of positives are

from the Longmont area.

As of August 9, the CDPHE is reporting 72 cases of WNV in the state, a

significant increase since last week. Nineteen cases are from Boulder

County; sixteen have been WNV fever but unfortunately two are meningitis

and one is encephalitis. For a complete listing of cases by county please

refer to the following link:

http://www.cdphe.state.co.us/dc/zoonosis/wnv/HUMAN_WNV_07.HTML

Adult Mosquito Trap Data

Date

Total Number of Mosquitoes

Number of Culex Mosquitoes

Percent Culex Mosquitoes

Number of non‑Culex mosquitoes

WNV presence

June 5

656

5.3%

621

June 12

372

6.5%

348

June 19

1049

107

10.2%

942

June 26

1038

164

15.8%

874

July 3

1348

542

40.2%

806

July 10

1062

436

41.1%

626

July 17

1052

295

28%

757

Yes

July 24

1254

706

56.3%

548

July 31

858

320

37.3%

538

August 7

833

157

18.8%

676

This week we captured 833 mosquitoes in our 16 city traps and 157 were

Culex (18.8% of total). The total number of mosquitoes is very similar to

last week but fortunately both the number and percent of Culex dropped

significantly for the second consecutive week.

Six pools of Culex mosquitoes were submitted to the Colorado Department

of Public Health and Environment (CDPHE) for WNV testing. Results were not

yet available for this week.

Mosquito Larval Control Information

Between July 31 and August 6, 271 sites were visited; 10 sites had

non‑vector mosquitoes and 22 received Bti treatments for Culex mosquitoes.

Comparisons to last year

The total mosquito numbers (409 in 2006; 833 in 2007) and the number of

Culex (114 in 2006; 157 in 2007) are higher than this week in 2006. The

percent Culex (27.9% for 2006; 18.8% for 2007) is lower than this week in

2006.

If you have any questions, please contact Jonathan Koehn, Environmental

Affairs Manager or Kathleen Alexander, Integrated Pest Management

Coordinator.