Scientists untangle causes of bee colony collapse disorder.

A little old, but just saw it. Thanks Jen!

A microscopic pathogen and pesticides embedded in old honeycombs are two major contributors to the bee disease known as colony collapse disorder, which has wiped out thousands of beehives throughout the United States and Europe over the past three years, new research at Washington State University has confirmed.

Working on the project funded in part by regional beekeepers and WSU's Agricultural Research Center, entomology professor Steve Sheppard and his team have narrowed the list of potential causes for colony collapse disorder.

"One of the first things we looked at was the pesticide levels in the wax of older honeycombs," Sheppard said. Using combs contributed by U.S. Department of Agriculture, Sheppard found "fairly high levels of pesticide residue."

Bees raised in those hives "had significantly reduced longevity," he said.

One easy solution is for beekeepers to change honeycombs more often. In Europe, for example, apiarists change combs every three years.

"In the U.S., we haven't emphasized this practice and there's no real consensus about how often beekeepers should make the change," said Sheppard. "Now we know that it needs to be more often."

More here.