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Widespread occurrence of neonicotinoid insecticides in streams in a high corn and soybean producing region, USA

July 24, 2014

Neonicotinoid insecticides are of environmental concern, but little is known about their occurrence in surface water. An area of intense corn and soybean production in the Midwestern United States was chosen to study this issue because of the high agricultural use of neonicotinoids via both seed treatments and other forms of application. Water samples were collected from nine stream sites during the 2013 growing season. The results for the 79 water samples documented similar patterns among sites for both frequency of detection and concentration (maximum:median) with clothianidin (75%, 257 ng/L:8.2 ng/L) > thiamethoxam (47%, 185 ng/L:<2 ng/L) > imidacloprid (23%, 42.7 ng/L: <2 ng/L). Neonicotinoids were detected at all nine sites sampled even though the basin areas spanned four orders of magnitude. Temporal patterns in concentrations reveal pulses of neonicotinoids associated with rainfall events during crop planting, suggesting seed treatments as their likely source.

Citation Information

Publication Year 2014
Title Widespread occurrence of neonicotinoid insecticides in streams in a high corn and soybean producing region, USA
DOI 10.1016/j.envpol.2014.06.033
Authors Michelle Hladik, Dana W. Kolpin, Kathryn Kuivila
Publication Type Article
Publication Subtype Journal Article
Series Title Environmental Pollution
Index ID 70117614
Record Source USGS Publications Warehouse
USGS Organization California Water Science Center; Toxic Substances Hydrology Program