Download - Dam the mosquitoes...full steam ahead: Garrison Dam Mosquito Management Project, Williston, ND
United States Air Force Reserve
Fly, Fight and Win…
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Dam the mosquitoes...full steam ahead: Garrison Dam Mosquito
Management Project, Williston, ND
Major Mark BreidenbaughMajor Karl Haagsma
Lt Col Don TeigAir Force Aerial Spray Unit
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Operational Mission Locations
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Historical mosquito problem
During the Corps of Discovery, Lewis & Clark encountered mosquitoes near Williston in
August 1806
Clark left Lewis a note:
“Game scarce, mosquitoes troublesome”
Williston, ND
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Reported WNV Disease Cases in Humans,United States, 1999-2009*
• Reported as of 12/31/2009
Year # Cases # Fatalities
1999 62 72000 21 22001 66 92002 4,156 2842003 9,862 2642004 2,539 1002005 3,000 1192006 4,269 1772007 3,630 1242008 1,356 442009* 663 22
16 %
5 %
6 %For the Dakotas
3 %
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Scope of the problem
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Warm welcome
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Williston mosquito larvicide 28 May - 4 June 2009
Application parameters: 230 mph ground speed 100 ft above ground level RA nozzles (24 straight back) 200 ft swath width 0.24 oz/acre (1.5 pints/acre) Vectobac 12AS (1200 ITU/mg) Began at sunrise 6,700 acres treated
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
ResultsPre and Post treatment samples of mosquito larvae in single standard dip samples at Skunk Hollow (N48°6.486,W103°40.746) pre-spray (31 May) and post-spray (1 June)
Skunk Hollow 1 2 3 4 5 6 % difference
Location 1
Location 2
pre 12 60 56 240 160 105.6 post 4 1 1 0 0 1.2 - 99% pre 160 12 36 140 75 84.6 post 6 0 8 8 2 4.8 - 94%
no spray area
72 88 68 12 84 64.8 72 80 32 40 130 70.8 + 9%
Larviciding depresses adult numbers in 2009?
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I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Etofenprox
Etofenprox molecule identified in the early ’80s in Japan
Similar mode of action to traditional pyrethroids (sodium channel blocker)
Low mammalian toxicity (LD50 > 42,000 mg/kg) Registered for mosquito control Sept 2008
(Zenivex) Registration was supported by DWFP grant ZenivexE20 aerial label, requires
conformational data for US EPA
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Methods
Pre-spray sampling: NJ light traps Landing rates
Monitored droplet deposition
Used field-collected mosquitoes for caged bioassays
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Williston mosquito adulticide 20 July 2009
Application parameters: 230 mph ground speed 150ft above ground level 8005 flat fan nozzles (10) 2000 ft swath width (1 swath
offset) 0.32 oz/acre (0.0035 lbs AI) began 1.5 hrs prior to sunset 24,000 acres treated
Winds: 280°/5-8 knots, ground 290°/12-18 knots, altitude
Wind direction
Williston area spray block
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Results
Field-collected mosquitoes were:
Ae. vexans 96% Ae. dorsalis 3%
Percent mortality of caged mosquitoes- corrected with Abbott’s formula
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Results
19-July 20-JulyBrotherinlaw 8 50
Walmart 4 0Ol' Police St 50 2
Bermuda 50 0Skunk Hollow 50 8
Landing rate counts
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Results
Ae. vexans collected in NJ traps
20-July 21-July 22-July 23-July0
500
1000
1500
2000
2500
3000
Spray
indi
vidu
als
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Conclusions
Zenivex was a easy to work with material: noncorrosive and flushed with BVA oil
Low toxicity makes it appealing
Effective at mid-level rate in high mosquito density environment
Price?
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Future plans
Strategies for increasing the period of mosquito relief include:
Increase surveillance and scouting to determine larval development sites and larvicide these areas
Increase adult surveillance to determine optimum application time
Increasing the size of the spray area to create a buffer zone around Williston
Consider applications on Army Corps land Multiple applications Begin at dusk for adulticide sprays
I n t e g r i t y - S e r v i c e - E x c e l l e n c e
Acknowledgements
Jeff Keller, Army Corps of Engineers Fran Bosch, Steve Kemp & staff, Williston Vector
Control Stephanie Whitman, Valent BioSciences Bill Reynolds & Dean Gaiser, Central Life Sciences Vicki Johnson, Minot AFB Karl Haagsma & Don Teig, AF Spray Flight Air Force Spray Flight aircrews & maintenance
personnel