Spatio-temporal impacts of aerial adulticide applications on populations of West Nile virus vector mosquitoes

Parasites & Vectors

Table 1 Estimated change in Culex mosquito populations following aerial spray events in California using Mulla’s formula

Location in California (city, county)	Year	Nights sprayed^a	Product class	Comparison length of time^b	Species	% Change^c	Reference
Davis, Yolo	2006	2	Pyrethrin	2 days before, 2 days after	Cx. pipiens	− 58.0	[19]
Davis, Yolo	2006	2	Pyrethrin	2 days before, 2 days after	Cx. tarsalis	− 25.6
Woodland, Yolo	2006	2	Pyrethrin	2 days before, 2 days after	Cx. pipiens	− 77.7
Woodland, Yolo	2006	2	Pyrethrin	2 days before, 2 days after	Cx. tarsalis	− 46.8
Sacramento, Sacramento	2005	3	Pyrethrin	7 days before, 7 days after	Cx. pipiens	− 75.0	[21]
Sacramento, Sacramento	2005	3	Pyrethrin	7 days before, 7 days after	Cx. tarsalis	− 48.7	[21]
Sacramento, Sacramento	2006	3	Pyrethrin	3 days before, 3 days after	Cx. pipiens	− 39.3	[85]
Sacramento, Sacramento	2006	3	Pyrethrin	3 days before, 3 days after	Cx. tarsalis	− 57.3	[85]
Coachella valley, Riverside	2005 (March)	3 alternate^d	Pyrethroid	5 days before, 1 day after	Cx. tarsalis	− 93.0	[20]
	2005 (June)	3 alternate^d	Pyrethroid	5 days before, 1 day after	Cx. tarsalis	− 77.0
	2005 (September)	3 alternate^d	Pyrethroid	5 days before, 1 day after	Cx. tarsalis	73.0

^aNumber of consecutive nights sprayed in a spray event
^bLength of time before and after an aerial spray event used when comparing with trap counts
^cPercentage change in Culex abundance following an aerial spray event, as calculated using Mulla’s formula [16, 17]
^dAerial spraying occurred on 3 alternate nights

ISSN: 1756-3305