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Dam the mosquitoes...full steam ahead: Garrison Dam Mosquito Management Project, Williston, ND

Dam the mosquitoes...full steam ahead: Garrison Dam Mosquito Management Project, Williston, ND. Major Mark Breidenbaugh Major Karl Haagsma Lt Col Don Teig Air Force Aerial Spray Unit. Operational Mission Locations. Historical mosquito problem.

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Dam the mosquitoes...full steam ahead: Garrison Dam Mosquito Management Project, Williston, ND

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  1. Dam the mosquitoes...full steam ahead: Garrison Dam MosquitoManagement Project, Williston, ND Major Mark Breidenbaugh Major Karl Haagsma Lt Col Don Teig Air Force Aerial Spray Unit

  2. Operational Mission Locations

  3. 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”

  4. Williston, ND

  5. Reported WNV Disease Cases in Humans,United States, 1999-2009* 6 % For the Dakotas 16 % 5 % • Reported as of • 12/31/2009 3 %

  6. Scope of the problem

  7. Warm welcome

  8. 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

  9. Results

  10. Larviciding depresses adult numbers in 2009?

  11. 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

  12. Methods Pre-spray sampling: • NJ light traps • Landing rates • Monitored droplet deposition • Used field-collected mosquitoes for caged bioassays

  13. 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

  14. Results Percent mortality of caged mosquitoes- corrected with Abbott’s formula Field-collected mosquitoes were: Ae. vexans 96% Ae. dorsalis 3%

  15. Results Landing rate counts

  16. Results Ae. vexans collected in NJ traps Spray individuals

  17. 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?

  18. 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

  19. Acknowledgements • Jeff Keller, Army Corps of Engineers • Fran Bosch, Steve Kemp & staff, Williston Vector Control • Stephanie Whitman, ValentBioSciences • 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

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