Impact of Sub-Lethal Exposure to Insecticides on Vector Control Lee Cohnstaedt and Sandra Allan USDA-ARS-CMAVE Triservices Meeting Feburary 2010 Lee Cohnstaedt.

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Presentation transcript:

Impact of Sub-Lethal Exposure to Insecticides on Vector Control Lee Cohnstaedt and Sandra Allan USDA-ARS-CMAVE Triservices Meeting Feburary 2010 Lee Cohnstaedt and Sandra Allan USDA-ARS-CMAVE Triservices Meeting Feburary 2010

Insecticide contact

Pyrethroids

If not dead, then what?

Mosquito species

Behavioral assays Entrance Air+ CO 2 *Capillary release attractant *CO 2 release 50ml/min Attractant *Infrared light was used illuminate nocturnally active mosquitoes. *Treatment level lethal dose 25

Flight path analysis Untreated Cx. quinquefasciatus Deltamethrin treated Cx. quinquefasciatus

Flight path analysis Untreated An. albimanus Permethrin treated An. albimanus

Flight path analysis Treated Ae. aegypti Untreated Ae. aegypti

Average flight velocity * *

Time in flight * *

Heading * *

Blood feeding *

Implications The sublethal affects of pyrethroids on a mosquito’s ability to detect and locate hosts may increase the efficacy of aerial and residual spraying treatments beyond their immediate killing impact.

Personal protective measures Band Sleeve Phlebotomus papatasi

TreatmentHandBandSleeve Bite protection Untreated20 (29%)11 (16%)37 (54%)--- Sleeve (permethrin)43 (26%)40 (24%)84 (50%)-28.5% Sleeve (permethrin) + Band (TL-I-73) 129 (27%)86 (18%)269 (56%)16.9% Band (TL-I-73)39 (49%)12 (15%)28 (35%)21.8% Sleeve (permethrin) + Band (UB-21) 27 (40%)12 (18%)28 (41%)94.1% Number of landings per 20 minutes Landing site

Band Sleeve

Implications Sand flies predominantly land on the sleeve before moving towards the exposed skin; therefore a lethal insecticidal barrier at the uniform-skin interface will reduce disease transmission.

Acknowledgments Uli Bernier Matt Aubuchon Adrian Duehl Erin Vrzal Nathan Newlon