Hello Paul & All,

> According to Bayer, only miniscule parts per billion traces of
> imidacloprid accumulate in the nectar / pollen so visiting
> bees and butterflies are not harmed even though they are
> inherently more susceptible to insecticides compared to the
> whiteflies, thrips, etc.

Taken from apixinfosource.com-   Background on Imadicloprid

" other studies indicated that concentrations were especially high when the 
plant is young. These would often be:
10-20PPB in upper leaves
100-200 ppb in other leaves
less than 1.5 ppb in nectar
2-3ppb in pollen

Bayer ( in court proceedings in France) then agreed that imadicloprid may 
cause disorentation of bees at levels above 20parts per billion.

Studies by researchers at the Institut National de la Recherche Agronomique 
(NRA) suggest that BEE BEEHAVIOR IS affected at levels between 3-16 ppb or 
possibly even 0.5 ppb.

source:
http;//apixinfosource.com/index.php?option=com-content&task=view&id=51&Itemid=51

bob 


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