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Informed Discussion of Beekeeping Issues and Bee Biology

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Subject:
From:
Paul Cherubini <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Thu, 26 Mar 2009 09:33:44 -0700
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>Recent data from Penn State on crabapple trees, 
>is extremely concerning.

Why the extreme concern when no evidence of
insect death or other harm was found?

> After three weeks no imidacloprid was
> detected.  However the next spring pollen samples
> from pollen sacs and anthers tested over 900 ppb 
> combined Imidacloprid and 2 principal
> degradants: 5- hydroxe and olefin.  In nectaries the 
> combined number was 1,450 ppb. 

Yes, but what, if any, harmful biological activity does
a 1,450 ppb insecticide residue in the nectaries have
after 6+ months exposure to an outdoor environment?

> the initial data raises questions about how imidacloprid
> is stored and translocated in woody plants, like fruit trees.

Why would it be important to have answers to these 
questions if a 6+ month old, 1,450 ppb residue in the 
nectaries is incapable of killing or harming pollinators 
in actual real world field situations?  

Paul Cherubini
El Dorado, Calif.

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