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I saw the PLoS paper when it came out. It does not clearly implicate miticides as a cause of bee mortality. The combs they tested had all sorts of chemicals in them. We have been raising a red flag for several years now about the danger of fungicides.
Chemical analysis of brood combs
The number of different pesticide residues detected in treatment
combs ranged from 4 to 17, averaging 10. The total number of
pesticides detected in all treatments was 39 including 7 fungicides,
2 herbicides, 23 insecticides (miticides included) and 7 metabolites
Experimental combs
Frames of treatment brood comb originated from migratory
Pacific Northwest beekeeping operations that used miticides and
from colonies provided by the USDA- ARS honey bee laboratory,
Beltsville, MD that were suspected to have died from Colony
Collapse Disorder.
Sub-Lethal Effects of Pesticide Residues in Brood Comb on Worker Honey Bee (Apis mellifera) Development and Longevity
Judy Y. Wu, Carol M. Anelli, Walter S. Sheppard
Received May 4, 2010; Accepted January 20, 2011; Published February 23, 2011
[note the lag time between submission and publication!]
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