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Informed Discussion of Beekeeping Issues and Bee Biology

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Subject:
From:
Peter Loring Borst <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Fri, 10 Apr 2015 19:10:00 -0400
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> And to this day, no one will even consider measuring the levels of contamination found in nectar and pollen after these injection treatments.

Actually, some research has been done:

> In USDA research on tree injections and soil drenches, maple and horse chestnut flowers were collected from trees that were trunk injected with imidacloprid 10–12 months earlier and residues of 130 ppb in 1 sample and 30–99 ppb in 5 samples were found. The report concluded that 130 ppb is in the range to cause mortality in bees. 

> Eucalyptus rudis trees were treated at label rates with the neonicotinoid systemic insecticide imidacloprid and nectar sampled at 5 months post-treatment during the spring bloom. The concentration of imidacloprid and its toxic metabolites in nectar was measured by ELISA at 660 ppb. 

PLB

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