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Local feral survivors in eight frame medium boxes.
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>Anybody know why the propolis is such a different color?

According to Huber and according to Marla Spivak, most propolis comes from poplar buds. There are many kinds of poplars and they often have different colored gum in their buds. It generally varies from green to bright red and several in between.

Propolis forages, like water foragers and nectar foragers, are recruited. Sometimes one hive gets recruited to one source while another gets recruited to a different source. This becomes obvious (unfortunately) with pesticide kills. It often affects some hives and not others depending on what they were foraging.
 
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