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

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

Location in California (city, county) Year Nights sprayeda Product class Comparison length of timeb Species % Changec Reference
Davis, Yolo 2006 2 Pyrethrin 2 days before, 2 days after Cx. pipiens − 58.0 [19]
Cx. tarsalis − 25.6
Woodland, Yolo 2006 2 Pyrethrin 2 days before, 2 days after Cx. pipiens − 77.7
Cx. tarsalis − 46.8
Sacramento, Sacramento 2005 3 Pyrethrin 7 days before, 7 days after Cx. pipiens − 75.0 [21]
Cx. tarsalis − 48.7
Sacramento, Sacramento 2006 3 Pyrethrin 3 days before, 3 days after Cx. pipiens − 39.3 [85]
Cx. tarsalis − 57.3
Coachella valley, Riverside 2005 (March) 3 alternated Pyrethroid 5 days before, 1 day after Cx. tarsalis − 93.0 [20]
2005 (June) 3 alternated Pyrethroid 5 days before, 1 day after Cx. tarsalis − 77.0
2005 (September) 3 alternated Pyrethroid 5 days before, 1 day after Cx. tarsalis 73.0
  1. aNumber of consecutive nights sprayed in a spray event
  2. bLength of time before and after an aerial spray event used when comparing with trap counts
  3. cPercentage change in Culex abundance following an aerial spray event, as calculated using Mulla’s formula [16, 17]
  4. dAerial spraying occurred on 3 alternate nights