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It sounds like robbing is the most likely answer. Once bees get a scent for free honey, they are hooked and my guess is that bees other than yours robbed out first one, then the other, colony. Usually you will see a number of dead bees lying around and some wax, although neither is always readily apparent, especially if there was not much capped honey.
New colonies MUST have their entrances severely reduced whenever there is not a good nectar flow on. Feeding during a dearth is a sure recipe for robbing.
Dry sugar on the top bars may get your colonies through if you are unable to get enough feed on them, and it does not incite robbing.
New colonies MUST have their entrances severely reduced whenever there is not a good nectar flow on. Feeding during a dearth is a sure recipe for robbing.
Dry sugar on the top bars may get your colonies through if you are unable to get enough feed on them, and it does not incite robbing.
