"RESTON, Va. -- A report shows concentrations of several major pesticides mostly declined or remained the same in the U.S. 'Corn Belt' rivers and streams from 1996 to 2006.
The U.S. Geological Survey said declines in pesticide concentrations closely followed declines in their annual applications. That, said researchers, suggests reducing pesticide use is an effective and reliable strategy for reducing pesticide contamination in streams.
Scientists studied 11 herbicides and insecticides frequently detected in the Corn Belt region, which generally includes Illinois, Indiana, Iowa, Nebraska and Ohio, as well as parts of adjoining states.
The USGS said that area has among the highest pesticide use in the nation -- mostly herbicides used for weed control in corn and soybeans."