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Informed Discussion of Beekeeping Issues and Bee Biology

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Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
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Sun, 20 May 2018 08:15:20 -0400
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> In the report they state: "High mite and associated virus levels are often the result of colonies weakened by pesticide exposure." 

On the other hand, quite the opposite was shown:

> Given the weight of evidence, chronic exposure to imidacloprid at the higher range of field doses (20 to 100 μg/kg) in pollen of certain treated crops could cause negative impacts on honey bee colony health and reduced overwintering success, but the most likely encountered high range of field doses relevant for seed-treated crops (5 μg/kg) had negligible effects on colony health and are unlikely a sole cause of colony declines. Currently there is wide agreement that sublethal exposure to imidacloprid can cause adverse effects on honey bees in laboratory studies but no evidence that this widely used insecticide is the major stressor causing colony declines. 

Dively GP, Embrey MS, Kamel A, Hawthorne DJ, Pettis JS (2015) Assessment of Chronic Sublethal Effects of Imidacloprid on Honey Bee Colony Health. PLoS ONE 10(3): e0118748. doi:10.1371/journal.pone.0118748

More recently:
> using neonicotinoid insecticides as an example, sublethal pesticide exposures can have pronounced effects on individual bees [77,78] and colony health and productivity [79,80]. To date, however, field trials have failed to demonstrate a link between real world exposures and increased mortality. 

Steinhauer, N., Kulhanek, K., Antúnez, K., Human, H., Chantawannakul, P., Chauzat, M. P. & Dennis vanEngelsdorp. (2018). Drivers of Colony Losses. Current Opinion in Insect Science.

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