>http://www.traceorganic.com/2013/presentations/JBailey%202013_WCTOW.pdf

This is an example of a well-done study, documenting actual residue levels
in the surrounding environment.

Note that in the wetlands surrounding seed-treated fields AFTER planting,
the level of clothianidin was 163 ng/L, which equals 0.16 ppb.  This is a
very low level--likely too low to show adverse effects on any but the most
sensitive organisms.

Of note also were the levels PRIOR to seeding, reflecting the residues from
previous years, which averaged 0.023 ppb.  So some of the insecticide
clearly persists, but at very low levels.  This would be expected due to
the more rapid degradation of clothianidin in surface water than in soil.
It would be of interest to see the levels in the sediment at the bottom of
the wetlands.

What I would also like to see is more analyses such as these of the nectar
and pollen in the noncrop flowering plants adjacent to the fields.

--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html