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Many bee colonies didn't survive the winter

by: PHOTO BY LYNN KETCHUM, COURTESY OF OSU - OSU entomologist Ramesh Sagili blows smoke in a hive to calm the bees. More than one-fifth of all the commercial honeybee hives in Oregon didn’t survive last winter, according to a survey by Oregon State University

Between Oct. 1 and March 31, Oregon beekeepers reported a 21 percent loss in their colonies. That’s on par with the state average of 22 percent annual losses over the past six years.

"These are challenging times for beekeeping and we have reason to be alarmed," says Ramesh Sagili, an entomologist with OSU’s College of Agricultural Sciences, who has been conducting honeybee colony loss surveys for the past five years. "While 10 to 15 percent loss of colonies is considered acceptable,” Sagili says, “current rates of decline could drive professional beekeepers out of business."

To replace lost colonies, beekeepers must split healthy hives of 50,000 bees or more – a process that takes months and adds substantial costs for labor, new queens and equipment. But as a result, the lost colonies are replaced.

The United States is home to 2.6 million managed honey bee colonies, according to the Bee Informed Partnership.

The U.S. Department of Agriculture credits honeybees with pollinating more than $15 billion worth of crops in the U.S., including pears, blueberries, cherries, apples, broccoli, mustard, carrots, onions and nut trees.

Bee colonies are in significant decline for a variety of reasons, Sagili says: Varroa mites, which transmit viral diseases to bees; poor nutrition from a restricted diet resulting from large-scale monocropping; and exposure to pesticides when bees forage for nectar and pollen. “Each of these factors add stress to the bees and compromise their immune systems,” Sagili says.

OSU is home to the Honey Bee Lab, which tests beekeepers' honeybees for mites, diseases and protein levels for a small fee.

Steve Law can reached at 503-546-5139 or This email address is being protected from spambots. You need JavaScript enabled to view it..

Twitter: @SteveLawTrib

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