> On Aug 27, 2015, at 7:46 AM, Jose Villa <[log in to unmask]> wrote:
> 
> Many have had poor experiences with supposedly resistant bees, leading to the concept that their utility may be limited to only certain environments, or to where they originated.  

I submit the following as evidence that breeding bees has a limited effect

> 32 colonies derived from various commercial lines kindly supplied by Mr. Linton Briggs were tested for expression of hygienic behaviour using the liquid nitrogen field assay. Of these colonies, 4 (12.5%) exhibited distinct hygienic behaviour, 13 (41%) were distinctly non-hygienic and the remaining 15 (46.5%) intermediate between the two. 

> It is very surprising that there has been _no improvement_ in the frequency of the hygienic trait since 1995, as industry has made considerable efforts to distribute hygienic stock (Wilkes & Oldroyd, 2002).
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