by 
Smurphy
ANSWERS: 3
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There are a number of theories, none of which has been conclusively proven. They include stress from being moved too much, improper diet, use of pesticides, global warming, and radiation from mobile phones.
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The most probable cause is from a non native mite that attacks bees and spreads a virus to the bees that they have no immunity to. I am looking into starting a small honey operation at my place and I am fortunate to have one of the largest bee supply outlets in the world very near by. They have recommended dusting new and old hives with a chemical to kill the mites as they have become almost epidemic.
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Sorry, meant to add that as a comment.
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