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Sun, 16 Mar 2014 14:55:48 -0400 |
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This study compares VSH, Russian, ordinary treated and untreated bees. To my eyes, the levels of mites seem very high as does the mortality. Yet, they present this as an example of success.
Infestations increased in all untreated groups through the rest of the season but at varying rates among bee types. Infestations rose most in CU [control untreated] and RHB [Russian] colonies and reached 14.2 V. destructor per 100 bees in October.
Infestation in the VSH outcross colonies rose until midsummer and then rose only slightly more (to 8.1 V. destructor per 100 bees) by October. In the CT [control treated] group, infestation increased to 6.8 V. destructor per 100 bees in summer and then decreased to 1.1 V. destructor per 100 bees in the autumn after a miticide treatment in _August_
In November, infestations increased in CU, RHB, and VSH outcross colonies (6.7-10.5 V. destructor per 100 bees) but decreased in CT colonies (1.4 V. destructor per 100 bees) after a late summer miticide treatment.
Approximately one fourth (29% in 2008; 23% in 2009) of colonies that were shipped to California for almond pollination in February were alive with original queens when they returned to Louisiana in October. Overall, queens were superseded in 35% of colonies in 2008 and 53% in 2009, and 37% of colonies died in 2008 and 24% in 2009. The estimated longevities of original queens did not differ among the bee types in 2008.
Functionality of Varroa-Resistant Honey Bees (Hymenoptera: Apidae) when used in Migratory Beekeeping for Crop Pollination
Author(s) :Robert G. Danka, et al
Source: Journal of Economic Entomology, 105(2):313-321. 2012.
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I wonder how you can refer to stock as being mite resistant when levels reach 14 per 100 bees going into winter. I was taught that level is way over the top. The mortality seems to indicate that this level is much too high, as well.
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