Abstract:

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.

More here:
http://pubs.er.usgs.gov/publication/70117614

Kind regards,


Ghislain De Roeck,
Belgium.

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