The winter mortality that is observed among tracheal mite infested colonies is
related to the infestation prevalence. In locations where extra stresses
prevail, such as greater length of winter, damp or cold, the mortality (even
without mites) is greater. The same "poor" conditions may cause reduced colony
growth rate, and therefore promote or allow a greater mite prevalence,...
 
So tracheal mites are a contributing factor to winter mortality, and they may be
the "last straw" for colonies in a marginal winter situation. But there may be
other last straws..
 
 
Kerry Clark, Apiculture Specialist
B.C. Ministry of Agriculture
1201 103 Ave
Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
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