Since mites did us the favor of really knocking out feral colonies in many
parts of the U.S., one may be able to keep bees and equipment clean and free of
Foul Brood without medication.
However, when feral colonies were common - and we see a bit of resurgence
amongst the feral colonies - if they weaken or die out from Foul Brood, your
bees will likely get it via robbing.
Personally, I found over the years that gifts of colonies from beekeepers
were not a good deal. To the degree possible, we use only comb that our bees
have drawn, and we treat packages when we get them.
Jerry
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