A much older study showed that there is far greater variation within populations of bees than between them, that bee stock is consistently pretty similar across regions. 

> Variation in North American Stocks of Bees
> There seems to be a strong feeling among some beekeepers that DD is due to some hereditary deterioration. The same idea has been expressed by some scientists. Our investigations were designed to reveal such a deterioration of certain stocks of bees if it does inderd exist.

> Little Evidence of Differences Among Stocks
> In 1977, two stocks from beekeepers who reported having DD and one stock from a beekeeper who had not experienced such a phenomenon were brought together for testing. No stock was found in a summer and fall of systematic observation to be statistically different from any other in combs of bees, brood, or pollen.

> Speculations on Causes of DD in Apiaries Where Stocks Were Obtained
> The fact remains that four beekeepers from whom we obtained our DD stocks reported having DD, and three beekeepers from whom we obtained control stocks had no DD. In our possession, DD stocks did not differ from control stocks with respect to DD. Consequently, we have *no evidence* that the differences in incidence of DD in the beekeepers' apiaries were due to genetic differences. On the contrary, we believe that the differences between DD arld control stocks observed by beekeepers were due primarily to differences in the environments.


Disappearing disease: III. A comparison of seven different stocks of the honey bee (Apis mellifera)
Creators:	Kulincevic, Jovan M.; Rothenbuhler, Walter C.; Rinderer, Thomas E. 
Research bulletin. 1160 (1984)

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