Alfalfa and bees
30 January 2010
Today’s gem from Wikipedia:
Alfalfa seed production requires the presence of pollinators when the fields of alfalfa are in bloom. Alfalfa pollination is somewhat problematic, however, because Western honey bees, the most commonly used pollinator, are not suitable for this purpose; the pollen-carrying keel of the Alfalfa flower trips and strikes pollinating bees on the head, which helps transfer the pollen to the foraging bee. Western honey bees, however, do not like being struck in the head repeatedly and learn to defeat this action by drawing nectar from the side of the flower. The bees thus collect the nectar but carry no pollen and so do not pollenate the next flower they visit. Because older, experienced bees don’t pollinate alfalfa well, most pollination is accomplished by young bees that have not yet learned the trick of robbing the flower without tripping the head-knocking keel. When western honey bees are used to pollinate alfalfa, the beekeeper stocks the field at a very high rate to maximize the number of young bees.
http://en.wikipedia.org/wiki/Alfalfa
