Nick Shilliff wrote:
 
<RE highbush blueberry pollination.We have had mixed results
effectively pollinating <blueberries over the past few years.last year
the bees worked the dandelions across <from the blueberries while
there were hundreds/thousands of bumblebees working <the blueberries
resulting in a bumper crop.this year we did not put honeybees in the
<blueberries and there were not many bumblebees pollinating,resulting
in a poor <crop.Is there any  reason that the beehives would draw in
the bumblebees?The <grower has searched around (Cornell etc)and from
 the info he has <received,concluded that bumblebees are better
pollinators of highbush berries.
 
Could it be that introducing honeybees to the area creates competition
for the other available forage, forcing the bumblebees to forage more
heavily on the blueberries?