Return to the Bees and Beekeeping Forum | Post a Follow-Up

 o
Asian parasite candidate for CCD cause

Posted by vundril 8 a Dallas TX (My Page) on
Fri, Jul 20, 07 at 11:04

http://www.planetark.com/dailynewsstory.cfm/newsid/43163/story.htm

Here is a link that might be useful: Planet Ark Rueters story


Follow-Up Postings:

 o
RE: Asian parasite candidate for CCD cause

Actually, better web etiquette is to post the direct link to source.

Here is a link that might be useful: Rueters article


 o
RE: Asian parasite candidate for CCD cause

Forget etiquette, here's the article.
The only problem is that the article doesn't spell out the treatment for this parasite.

Asian Parasite Killing Western Bees - Scientist
---------------------------------------------------------------------- ----------
SPAIN: July 19, 2007

MADRID - A parasite common in Asian bees has spread to Europe and the Americas and is behind the mass disappearance of honeybees in many countries, says a Spanish scientist who has been studying the phenomenon for years.

The culprit is a microscopic parasite called nosema ceranae said Mariano Higes, who leads a team of researchers at a government-funded apiculture centre in Guadalajara, the province east of Madrid that is the heartland of Spain's honey industry.
He and his colleagues have analysed thousands of samples from stricken hives in many countries.

"We started in 2000 with the hypothesis that it was pesticides, but soon ruled it out," he told Reuters in an interview on Wednesday.

Pesticide traces were present only in a tiny proportion of samples and bee colonies were also dying in areas many miles from cultivated land, he said.

They then ruled out the varroa mite, which is easy to see and which was not present in most of the affected hives.

For a long time Higes and his colleagues thought a parasite called nosema apis, common in wet weather, was killing the bees.

"We saw the spores, but the symptoms were very different and it was happening in dry weather too."

Then he decided to sequence the parasite's DNA and discovered it was an Asian variant, nosema ceranae. Asian honeybees are less vulnerable to it, but it can kill European bees in a matter of days in laboratory conditions.

"Nosema ceranae is far more dangerous and lives in heat and cold. A hive can become infected in two months and the whole colony can collapse in six to 18 months," said Higes, whose team has published a number of papers on the subject.

"We've no doubt at all it's nosema ceranae and we think 50 percent of Spanish hives are infected," he said.

Spain, with 2.3 million hives, is home to a quarter of the European Union's bees.

His team have also identified this parasite in bees from Austria, Slovenia and other parts of Eastern Europe and assume it has invaded from Asia over a number of years.

Now it seems to have crossed the Atlantic and is present in Canada and Argentina, he said. The Spanish researchers have not tested samples from the United States, where bees have also gone missing.

Treatment for nosema ceranae is effective and cheap -- 1 euro (US$1.4) a hive twice a year -- but beekeepers first have to be convinced the parasite is the problem.

Another theory points a finger at mobile phone aerials, but Higes notes bees use the angle of the sun to navigate and not electromagnetic frequencies.

Other elements, such as drought or misapplied treatments, may play a part in lowering bees' resistance, but Higes is convinced the Asian parasite is the chief assassin.

Story by Julia Hayley

REUTERS NEWS SERVICE


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Bees and Beekeeping Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here