On 08/06/2012 15:26, Bill T wrote:
> [...] since bees are affected by nectar
> sources with neonics at specific concentrations as shown in the RFID
> studies, and that effect seems to be fairly quick as the bees are
> disoriented and do not make it back to the hive. That would seem to
> indicate that the pesticide has entered the bee's system before moving from
> the crop.
>
The same problem is raised by the recent EFSA statement 
dx.doi.org/10.2903/j.efsa.2012.2752 .
EFSA linked neonicotinoid absorption to the sugar requirements of 
forager bees, referring to Rortais et al. (2005 
http://dx.doi.org/10.1051/apido:2004071 ) but they do not consider the 
possibility of diffusion from the crop to neighboring tissues.
To my knowledge the only studies on neonicotinoid kinetics are Suchail 
et al. (2004 http://dx.doi.org/10.1002/ps.895) and Brunet et al. (2005 
http://dx.doi.org/10.1002/ps.1046). Unluckily both studies do not 
include the crop as a separate compartment in the distribution model, so 
I believe there is still a lack of knowledge in the kinetic of 
neonicotinoids and consequently in the exposition of forager bees.
Maybe someone who worked on the topic could provide us with more updated 
information.

Umberto Vesco
DVM, PhD
Italy

-- 
Umberto Vesco
DVM, PhD
Italy

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