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<blockquote data-quote="Alastair" data-source="post: 11894" data-attributes="member: 13"><p>Just to explain that further, during the summer the bee population builds up, and also the mite population. Eventually the bee population stabilizes and in autumn starts to reduce, but the mite population keeps growing. So there may be older adult bees that were not affected by mites, they are the flying bees and entrance activity can look good. But more and more brood is affected and a point is reached where nearly all brood is affected, this is when you start seeing symptoms in the hive such as dead brood and sick adults, even while entrance activity by the older unaffected bees can still look good.</p><p></p><p>Now, there will be increasing amounts of brood that dies, and if it does hatch the bees will not live long. Plus the older healthy looking bees are old and die soon. The hive can go from seemingly packed with bees, to dead in a few weeks.</p><p></p><p>Do not be fooled by seeing lots of bees still in the hive. If mite symptoms are seen you gotta treat now. What I also do in these cases is give them a comb of healthy brood from another hive as well as the treatment. This means that even if all the hive bees die off before the treatment has time to kill the mites and the bees die before they can raise healthy brood, the frame of healthy brood from another hive will hatch and the hive survive long enough to get a cycle of healthy brood through.</p></blockquote><p></p>
[QUOTE="Alastair, post: 11894, member: 13"] Just to explain that further, during the summer the bee population builds up, and also the mite population. Eventually the bee population stabilizes and in autumn starts to reduce, but the mite population keeps growing. So there may be older adult bees that were not affected by mites, they are the flying bees and entrance activity can look good. But more and more brood is affected and a point is reached where nearly all brood is affected, this is when you start seeing symptoms in the hive such as dead brood and sick adults, even while entrance activity by the older unaffected bees can still look good. Now, there will be increasing amounts of brood that dies, and if it does hatch the bees will not live long. Plus the older healthy looking bees are old and die soon. The hive can go from seemingly packed with bees, to dead in a few weeks. Do not be fooled by seeing lots of bees still in the hive. If mite symptoms are seen you gotta treat now. What I also do in these cases is give them a comb of healthy brood from another hive as well as the treatment. This means that even if all the hive bees die off before the treatment has time to kill the mites and the bees die before they can raise healthy brood, the frame of healthy brood from another hive will hatch and the hive survive long enough to get a cycle of healthy brood through. [/QUOTE]
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