this thesis is now 20 years old, but is of interest in context

When statistically significant traits and those traits that have numerical differences are both considered, neither Primorsky Russian nor Ontario stocks were superior in all traits. Neither stock had a clear cut advantage in all tested traits, rather the Primorsky Russian honeybees tended to have superior Varroa mite resistance traits while the Ontario colonies had superior economic traits. 

Beekeepers need to use bees that give them the greatest economic benefit. Beekeepers cannot use bees that are only superior in one trait. Rather, they must find a balance of traits including honey production, overwintering, disease resistance and swarming to provide the most economic benefits (Nasr and McRory 1995, van Englsedorp and Otis 2001).

Geoffrey Wilson (2004) A COMPARISON OF PRIMORSKY RUSSIAN, ONTARIO, AND HYBRID STOCKS OF HONEYBEES:

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