Pesticide drift from two insecticides -- chlorypyrifos and endosulfan -- travels by wind and water to cause deadly conditions for Pacific treefrogs and foothill yellow-legged frogs, two species native to mountain meadows in the Sierra Nevada range. New research shows that after the two pesticides are applied in California's Central Valley, they drift on easterly winds, land in the Sierras through rain and snow and are spread by runoff. The research was published in the August 2009 issue of Environmental Toxicology and Chemistry.
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