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Date: | Wed, 28 May 2003 14:18:55 -0600 |
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>>>Although researchers are not finding coumaphos levels high enough for
researchers to say for sure nest contamination is a problem early queen
supercedure is on the rise in hives of commercial beekeepers using
checkmite.<<<
Finding residues of Coumaphos in brood combs is confirmed by my research
results. Please check p322 in American bee Journal April 2003. We found
Fluvalinate in wax samples (n=16) with an average of 2.58 ppm. Coumaphos
was found in 83% of honey samples with a range >3-8 ppm. High levels of
coumaphos (Average= 45.53 ppm, n= 8) were found in wax samples from
colonies where failing queens were found and subleathal toxicity to bees
were observed. Wax samples (n=8) collected from good active colonies had
an average of 23.66 ppm coumaphos. These results show that coumaphos
accumulated residues in the wax faster than fluvalinate. High levels of
accumulated coumaphos residues in wax in brood chambers could be
implicated in reported queen failure in bee colonies. In Europe, where
beekeepers use Perzin which contains Coumaphos as active ingredient for
varroa control, levels of accumulation of coumaphos residues in the wax
are much lower than using CheckMite strips.
Medhat
Medhat Nasr, Ph. D.
Provincial Apiculturist
Pest Risk Management Unit
Crop Diversification Centre North
RR 6, 17507 Fort Road
Edmonton, AB, Canada T5B 4K3
Tel: (780) 415-2314 Fax: (780) 422-6096
Mailto:[log in to unmask]
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