There are a number of mechanisms of varroa resistance that have been documented or implied like hygienic behavior, grooming and physiological resistance. There are undoubtedly many more forms of mite resistance--the challenge is to find stocks that are able to resist mite development and disease infections BY ANY METHOD. There does not need to be a great deal of concern about what form of resistance you bring into your colonies, since it is a very good idea to have as many types of resistance in yourarea colonies as you can find. In fact, there are stocks that are resistant to mites and we do not know the resistance mechanism. Let me put it this way: I do not need to know how the Internet works to read my email! But where will you find these stocks?
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