Precursor symptoms that may arise before the final colony collapse are:

It suggested that colony collapse may be caused by the interaction of many agents in combination.

Since 2006, 20 to 40 percent of the bee colonies in the United States alone have suffered "colony collapse."

But researchers on both sides say that colony collapse may be the first time that the defense machinery of the post-Sept.

Bees tend to die away from the apiary, which causes a reduction in food gathered and can eventually lead to colony collapse.

DeRisi has also studied colony collapse among honeybees.

There are no signs of "colony collapse" which is plaguing bees worldwide.

Biochemist Lin Field said the decision was based on "political lobbying" and could lead to the overlooking of other factors involved in colony collapse disorder.

The compound has been linked to neurological problems in bees, and may be a factor in colony collapse.

Some researchers have detected increased aggressiveness immediately before colony collapse, and suspect that the virus may play a role.