>Then SMR was felt to be the missing link. However as soon as one quit using
the queens and out breeding occurred the varroa tolerance started dropping.<

If one goes to the trouble to introduce this trait into their operation shouldn't they also continue to develop it? I see it as a leg up tool to get from point A to ever changing.

Would there be some difficulties in tweaking this trait out further once introduced into ones own Apiary?

Thanks!

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