> I think it highly improbable that we can't produce a nutritionally complete pollen substitute. There are two caveats. They are palatability and cost.
And the third: the wisdom of stimulating the colonies at inappropriate times. Otis and Mattila suggested that pollen supplements in the fall could be deleterious. See
HEATHER R. MATTILA and GARD W. OTIS
Dwindling pollen resources trigger the transition to broodless populations of long-lived honeybees each autumn
Ecological Entomology Volume 32, Issue 5 Pages 437–582
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