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Date: | Tue, 9 Feb 2021 12:02:07 -0700 |
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It is hard to believe that there could be poor reproduction of a
species or type of varroa on European bees. But there are a good
number of examples of those encounters in Southeast Asia where the
apparently odd occurs. The paper in Insects clearly shows one
situation. Unfortunately, because it is so hard to get decent amounts
of mites from Apis cerana, they did not inoculate that type and source
of mites back into their brood, so we are left only with the finding
that those mites did not reproduce on A. mellifera.
There is either a signal off brood from Apis mellifera that is missing
for the mites to initiate egg laying, or the mites in A. cerana
colonies have a past history (encounters with groomers, hygienic
removal from cells, other unknowns) that somehow compromises their
reproductive ability when given a chance (dropped into a cell, placed
into an incubator, and thus removed from hygienic activities).
There are nuggets of information in all of this, but no one has come
across the mother lode.
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