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Date: | Mon, 24 Sep 2012 22:18:12 +0200 |
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On 03/09/2012 21:57, randy oliver wrote:
>>> Anyone else had similar experiences?
> Obviously, either the mites in Canada grip tighter, or Allen just doesn't
> shake it like he used to.
>
> I tried a number of times when the sugar shake first came out. I recovered
> about 70% of the mites by sugar, and the rest by alcohol.
Impressed by your and allen's results we did our experiment:
we shaked 59 jars with 1 spoon of icing sugar and more or less 100 ml of
bees in a 390 ml jar with full net lid, quite hard for 90 seconds.
Then we put in the same jars more or less 150 ml of a mixture of 50%
alcohol, 50% water and some strong soap. After a time ranging from 6
hours to 48 hours we shaked hard for 3 minutes and filtered, still
washing with running water and moving and "massaging" dead bees for 2-3
minutes more.
The result is that sugar dislodged a mean of 94.9% of total mites,
standard deviation 7.8%.
Only in 4 cases efficacy was under 80%, minimum 74%.
We counted bees from 30 jars and found that the mean was 313 bees,
standard deviation 43.
>
> When I recently watched Katie Lee demo the sugar shake, she shook the jar
> so hard that I was surprised that any bees survived!
In another time we put the bees shaked bees under the hive roof with
communication with the supers. After 1 hour more or less 10 bees (3%)
were dead under the roof. Of course I don't know which was the life
expectancy of the others that had enough energy to escape from there...
--
Umberto Vesco
DVM, PhD
Italy
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