> The number of samples varies based on your question and what level of
> accuracy required. It is completely a different kind of science. The
> simple answer is:

> 6. >500 sample 56- 59
>
> In this top case, you will treat all colonies based on sample results.


I am not understanding this chart. Are you saying that in a bee operation 
larger than 500 colonies you would recommend taking 56 - 59 samples and if 

any sample shows greater than a certain level of mite infestation you 
would 
treat the entire operation?


Tom: I did not say if any sample shows greater than a certain level of 
mite infestation you would treat. You will take the average of your mite 
levels and if the average is above certain level < In our case we use 3% 
as the economic threshold for varroa in Alberta>, then you treat.

Please keep in mind my first statement in the top of this e-mail.  To 
reduce variations, ll colonies are treated at the same time with the same 
product. To  improve the sampling system,  we take 8 hives/ apiary of 
(32-48 hives)  and test 7 -8 apiaries picked randomly in  the bee 
operation. Then, you calculate the average of percentage of mite 
infestation. This average is used to make decision. 

The average commercial operation in Alberta is 2200 hives/ commercial 
beekeeper. The above sample size gives an acceptable indication of varroa 
infestation. Of course if you would like to take more samples to get 
better accurate results, it will cost more money and time. Statistically 
is great to take more samples. 



             ***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software.  For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html

Guidelines for posting to BEE-L can be found at:
http://honeybeeworld.com/bee-l/guidelines.htm