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Author Topic: Paper published August '13-- Survivorship after Nosema ceranae infection.  (Read 937 times)

Offline JWChesnut

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There's a new paper -- Influence of Pollen Nutrition on Honey Bee Health: Do Pollen Quality and Diversity Matter?
Available as a open download -- http://www.plosone.org/article/fetchObject.action?uri=info%3Adoi%2F10.1371%2Fjournal.pone.0072016&representation=PDF 

Most interesting and crucially important in my reading are the detailed survivorship curves after Nosema ceranae infection:



This shows that bees infected with the new Asian virulent Nosema ceranae are going die in enormous numbers at the time of House Bee >> Forager Bee transition.   The key marker for CCD is loss or foragers (depopulation with brood and queen still resident).  Nosema ceranae is isolated as  the single controlled "insult" is shown to effect this depopulation in this study.

This of course was identified as a disease factor many years ago, and Fumagilin treatment has become routine.  However, a really important paper was published in March '13 --Nosema ceranae Escapes Fumagillin Control in Honey Bees   Free access at: http://www.plospathogens.org/article/info%3Adoi%2F10.1371%2Fjournal.ppat.1003185

This paper shows that Nosema ceranae actually becomes more virulent by treatment. The old Nosema -- N. apis -- is wiped out (as are many competitive organism) -- and N. Ceranae expands into the void created by the vacuum.

Huang W-F, Solter LF, Yau PM, Imai BS (2013) Nosema ceranae Escapes Fumagillin Control in Honey Bees. PLoS Pathog 9(3): e1003185. doi:10.1371/journal.ppat.1003185

Online sawdstmakr

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Nice post, thanks. This ties in with reports on the importance of the bees having a good variety of pollen sources to keep the bees alive. Bees used for pollination are normally in areas with just one plant species, like almonds. And this article seems to explain why. This supports the almond growers need to plant bee flowers between the rows of almonds to keep the bees healthy. Some have started to do this year.
Jim
"If you don't read the newspaper you are uninformed.  If you do read the newspaper you are misinformed."--Mark Twain

Offline JWChesnut

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Yes, getting Arroyo Willow (Salix lasiolepis) hedgerows established in Almond fields should be a huge help. Lot of the Almond is on broken land on the fringe of the valley, and has drainages that run through.  These have been "cleared" of veg, but we need to let the willow come back and fill those ephemeral streams.  Salix has nectar that is 50% sugar, and as a catkin (wind pollinated) flower structure has abundant pollen.  Blooms January-March on the coast, and about Almond season in the SJ valley.

Local secret: when the truckloads of migratory bees come to the coast to condition for the Almonds, the yards with Arroyo Willow thickets for December-January brood buildup are the ones that fire up.  The Blue Gum Eucalyptus yards, not so much.  Euk is only 13% sugar, and I think it discourages the brood build out - too watery.  Of course most of the migratory bees just slap on a paint pail of syrup and a roll of sub.