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Pesticide Investigations

USGS Scientist at a computer used to control laboratory analytical equipment.
USGS scientists used advanced analytical equipment to investigate the composition of POEA (polyoxyethylene tallow amine). Photo credit: Daniel Tush, USGS.

USGS Scientist dissecting a summer flounder.
USGS scientist dissecting a summer flounder as part of a study on the fate of pesticides in an estuary near Guadalupe, California. Photo credit: James Orlando, USGS.

A view of a farm fields in Iowa.
USGS scientists have found glyphosate, which is frequently applied to corn and soybeans growing areas like these in Iowa, to be widespread in the environment. Photo Credit: William A. Battaglin, USGS.

Graph of detection frequencies for glyphosate and AMPA by hydrologic setting.
Graph of detection frequencies for glyphosate and its degration product AMPA (aminomethylphosphonic acid) by hydrologic setting. The common weed killer glyphosate is widespread in the environment.

A Pacific Chorus frog in meadow located in Yosemite National Park.
USGS scientists found pesticides in amphibians such as this Pacific Chorus frog. The fog was found in meadow located in Yosemite National Park. Photo credit: Devin Edmonds, USGS.

USGS scientist collecting water samples from a pond.
USGS scientist collecting water samples from an amphibian monitoring site in Livermore, California. USGS scientists found pesticides in frogs from remote areas in California. Photo credit: James Orlando, USGS.

USGS scientists installing passive sediment samplers in an irrigation ditch.
USGS scientists installing passive sediment samplers in an irrigation ditch near Hancock, Wisconsin. The samplers are designed to collect suspended sediment from streams over a 3-week period, and were used during a study of the occurrence of fungicides in streams and groundwater. Photo credit: Timothy Reilly, USGS.

Mill Creek in Salt Lake City Utah
Contamination and toxicity in streambed sediments caused by pyrethroid insecticides generally increased with the degree of urbanization in this stream (Mill Creek in Salt Lake City, Utah) and six other metropolitan areas across the Nation. Photo credit: Alan Cressler, USGS.

USGS scientist working with a gas chromatograph/mass spectrometer.
USGS scientist uses a very sensitive instrument to measure concentrations of pyrethroid insecticides in sediments. By comparing chemical concentrations to toxicity measured in laboratory tests, USGS scientists can show that pyrethroids are likely a major cause of the observed toxicity in streams.

Estimated annual use rate and the maximum observed concentration of the fungicide azoxystrobin.
Estimated 2002 annual use rate for the fungicide azoxystrobin, and the maximum observed concentration of azoxystrobin in stream-water samples collected in 2005 and 2006.

The 2002 average annual agricultural use of chlorothalonil in the southeastern United Sates.
The 2002 average annual agricultural use of chlorothalonil in the southeastern United Sates (based on National 2002 Pesticide Use Maps). Chlorothalonil is an agricultural fungicide widely used on peanuts, potatoes, and other crops.

USGS scientist holding the shore crab, Hemigrapsus oregonensis, Bodega Bay, Calif.
The shore crab, Hemigrapsus oregonensis, collected from a rocky cove near Bodega Bay, California. These crabs are reproductively active during the summer months and carry hundreds of embryos under their carapace until hatching occurs. Scientists found crab embryos from the bay's salt marsh with accumulations of mixtures of currently used and discontinued pesticides.

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Page Last Modified: Thursday, 05-Jun-2014 12:14:11 EDT