California pesticide use summary data and use reports from local vector control agencies were reviewed to document public health pesticide use patterns. During the 15-year period 1993–2007, public health pesticide use averaged 1.75 million lb (0.79 million kg) (AI), accounted for <1% of reportable pesticide use statewide, and ranked below major crop uses and many nonagricultural uses. A review of reports from local vector control agencies (2004–07) indicated that their applications were principally for mosquito control and represented >99% of all reported public health pesticide use. Petroleum distillates, principally larviciding oils, accounted for 88% of public health pesticide use. Pyrethrins and naled, used as mosquito adulticides, increased substantially in recent years (post-2004), coinciding with increased West Nile virus control activities and availability of emergency funding.
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