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The varroa mite was introduced to N. America 40 years ago, but it has only been the last 20 that have been bad. The mites feed on bee larvae and spread viruses. The feral populations seem to have developed some resistance, but the major producers of domesticated bees have to use miticides to keep the colonies alive.

I catch and propagate feral bees. The honey production is less, but I don't have to dose them with chemicals to keep them alive.

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Interesting. Thank you.