I do believe some type of pollen substitute should be given in the fall especially if they have no reserves for winter. Hopefully sgtmom will chime in.
I use sugar syrup until the temps start to really drop, usually Oct after that if they still need sugar I switch to fondant. Just like chickens too much moisture in the hive is hard on the bees, so they need to have time to cap syrup before it gets too cold. You can use 2:1 syrup for fall feeding so they can cap it faster.
In most areas supplemental pollen is not needed going into the winter. In PA we have more than enough fall pollen producing plants for the bees. The best time for pollen feeding is in late winter (Jan/Feb) to encourage early brood rearing.
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