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![Page 1: Trends in diazinon and other urban pesticides in stream samples from the northeastern United States, 1993-2004 1 US Geological Survey, Troy NY 2 US Geological.](https://reader035.fdocuments.in/reader035/viewer/2022070410/56649f225503460f94c3ae88/html5/thumbnails/1.jpg)
Trends in diazinon and other urban pesticides in stream samples from
the northeastern United States, 1993-2004
1 US Geological Survey, Troy NY2 US Geological Survey, Baltimore MDContact: [email protected]
P. J. Phillips1, S. W. Ator2,
E. A. Nystrom1
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Why should we be concerned Why should we be concerned about Diazinon?about Diazinon?• One of the most frequently detected One of the most frequently detected
pesticides in urban streamspesticides in urban streams
• Widely used lawn insect controlWidely used lawn insect control
• Concentrations exceeded benchmark Concentrations exceeded benchmark levels for protection of aquatic lifelevels for protection of aquatic life
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Diazinon/Chlorpyrifos Diazinon/Chlorpyrifos PhaseoutPhaseout
• Began in 2002Began in 2002
• Completed in Completed in
20042004
From Schreder and Dickey, 2005
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Pesticides Included In Trend Pesticides Included In Trend AnalysisAnalysis INSECTICIDESINSECTICIDES
• Diazinon, Chlorpyrifos (decreasing)Diazinon, Chlorpyrifos (decreasing)
• Carbaryl (increasing?)Carbaryl (increasing?)
• Malathion (no change)Malathion (no change)
HERBICIDESHERBICIDES
• Prometon, Simazine (no change)Prometon, Simazine (no change)
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NAWQA Trends Network in NAWQA Trends Network in Northeast USNortheast US
20 sites used20 sites usedto analyzeto analyzeDiazinon Diazinon
trendstrends
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Diazinon From Urban Diazinon From Urban SourcesSources
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Apparent Decreasing Trends Apparent Decreasing Trends for Diazinon, Chlorpyrifosfor Diazinon, ChlorpyrifosConcentrations at Accotink Creek, Concentrations at Accotink Creek,
VirginiaVirginia
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Diazinon Decreased after Diazinon Decreased after PhaseoutPhaseout
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Chlorpyrifos Decreases, Chlorpyrifos Decreases, Carbaryl has no changeCarbaryl has no change
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No Step Trends in No Step Trends in HerbicidesHerbicides
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Comparison of Step Trends at 20 Comparison of Step Trends at 20 SitesSites
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Decrease in Exceedence of Decrease in Exceedence of Diazinon Chronic Benchmark Diazinon Chronic Benchmark LevelLevel
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Changes Due to Phase OutChanges Due to Phase Out• Diazinon Decreases of 50% or more Diazinon Decreases of 50% or more
during summerduring summer
• Near-elimination of chlorpyrifosNear-elimination of chlorpyrifos
• No change in CarbarylNo change in Carbaryl
• No evidence of regional herbicide No evidence of regional herbicide changeschanges
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Future QuestionsFuture Questions• Will we see improvement in urban Will we see improvement in urban
aquatic communities?aquatic communities?
• What is replacing Diazinon?What is replacing Diazinon? Not Carbaryl in NortheastNot Carbaryl in Northeast Imidacloprid? Pyrethroids?Imidacloprid? Pyrethroids?
• Will we be able to see further Will we be able to see further changes?changes?
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AcknowledgementsAcknowledgementsData collected by NAWQA Study Units