Thursday, 29 April 2010

CATCH THE BUZZ - Winter Losses Just Over 33%

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AIA Reports Winter Losses Just Over 33%

April 22, 2010


Dennis vanEngelsdorp1, Jerry Hayes2, Dewey Caron3, and Jeff Pettis4.This is a preliminary analysis, and a more detailed final report is being

prepared for publication at a later date.

The Apiary Inspectors of America (AIA) and USDA-ARS Beltsville Honey Bee Labconducted a survey to estimate winter colony loses for 2009/2010. Over 22.4% of thecountry’s estimated 2.46 million colonies were surveyed.A total loss of 33.8% of managed honey bee colonies was recorded. This compares tototal losses of 29%, 35.8% and 31.8% recorded respectively in the winters of 2008/2009,2007/2008 and 2006/2007.


In all 4,207 beekeepers responded to the on-line survey and an additional 24 werecontacted by phone. This response rate is orders of magnitude greater than previous yearsefforts which relied on phone or email responses only (2008/2009 n=778, 2007/2008n=331, 2006/2007 n=384).

On average responding beekeepers lost 42.2% of their operation, this is an 8 point or 23%increases in the average operational loss experienced by beekeepers in the winter of2008/2009.

Average losses were nearly 3 times greater than the losses beekeepers reported that theyconsidered acceptable (14.4%). Sixty-one percent of beekeepers reported losses in excess of what they would consider acceptable.

Colony Collapse Disorder (CCD) is characterized, in part, by the complete absence ofbees in dead colonies and apiaries. This survey was not designed to differentiate betweendefinitive cases of CCD and colonies lost as the result of other causes that share the“absence of dead bees” symptom. Only 28% of operations reported that at least some oftheir dead colonies were found dead without dead bees. However this group lost a totalof 44% of their colonies, as compare d to the total loss of 25% experienced by beekeeperswho did not report losses indicative of CCD.

Responding beekeepers attributed their losses to starvation (32%), weather (29%), weakcolonies in the fall (14%), Mites (12%), and poor queens (10%). Only 5% of beekeepersattributed CCD as the major cause for their losses.

It is also important to note that this survey only reports on winter losses and does notcapture the colony losses that occurs throughout the summer as queens or entire coloniesfail and need to be replaced. Preliminary data from other survey efforts suggest that these“summer” losses can also be significant. All told the rate of loss experienced by theindustry is unsustainable.

1. Dennis vanEngelsdorp, The Pennsylvania State University/Apiary Inspectors ofAmerica (AIA), Past-President 717-884-21472. Jerry Hayes, Florida Department of Agriculture, AIA Past President, 352 372-35053. Dewey Caron, Oregon State Univ., 302 353-99144. Jeff Pettis USDA-ARS Bee Research Laboratory, Beltsville, MD,, 301 504-8205

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