Aquatic Effects of Aerial Spraying for Mosquito Control over an Urban Area
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- 作者：Donald P. Weston ; Erin L. Amweg ; Abdou Mekebri ; R. Scott Ogle ; Michael J. Lydy
- 刊名：Environmental Science & Technology
- 出版年：2006
- 出版时间：September 15, 2006
- 年：2006
- 卷：40
- 期：18
- 页码：5817 - 5822
- 全文大小：173K
- 年卷期：v.40,no.18(September 15, 2006)
- ISSN：1520-5851
文摘
In an effort to combat West Nile Virus, planes dispersedinsecticide over Sacramento, CA, treating nearly 50,000hectares with pyrethrins and the synergist piperonyl butoxide(PBO). Widespread dispersal of insecticide over ametropolitan area, coupled with extensive pretreatmentdata on the area's urban creeks, provided a unique opportunityto study effects of mosquito control agents on aquatichabitats within an urban setting. There was no evidenceof aquatic toxicity from the two active ingredients in theproduct applied. However, PBO concentrations werehigh enough to enhance toxicity of pyrethroids alreadyexisting in creek sediments from general urban pesticideuse. PBO concentrations of 2-4 
g/L were high enough tonearly double the toxicity of sediments to the amphipodHyalella azteca. Though the increase in toxicity was modest,it was unexpected to find environmental synergy at all.Risk assessments for mosquito control agents have focusedon the active ingredients but have failed to recognizethe potential for interactions with pesticides previouslyexisting in the environment, which in this case appearedto represent a risk to aquatic life greater than that of theactive ingredients themselves.
g/L were high enough tonearly double the toxicity of sediments to the amphipodHyalella azteca. Though the increase in toxicity was modest,it was unexpected to find environmental synergy at all.Risk assessments for mosquito control agents have focusedon the active ingredients but have failed to recognizethe potential for interactions with pesticides previouslyexisting in the environment, which in this case appearedto represent a risk to aquatic life greater than that of theactive ingredients themselves.