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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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Posted: Wed Nov 14, 2012 1:29 pm Post subject: Varroa out of control - what pesticides got to do with it |
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Varroa out of control - what pesticides got to do with it
http://www.immenfreunde.de/docs/PKB_engl.pdf
Put down a summary of what I think is the trouble with pesticides and bees.
Bernhard |
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biobee Site Admin

Joined: 14 Jun 2007 Posts: 1059 Location: UK, England, S. Devon
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Posted: Wed Nov 14, 2012 6:10 pm Post subject: |
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Brilliant work, Bernhard - a clear summary.
Thank you. |
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Che Guebuddha Golden Bee

Joined: 31 Jan 2012 Posts: 1551 Location: Hårlev, Stevns Kommune, Denmark
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Posted: Wed Nov 14, 2012 8:07 pm Post subject: |
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Nice. I placed it on my blog into the Links section. Well worth propagating. |
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Mark Young Scout Bee
Joined: 27 Jan 2011 Posts: 277 Location: High Weald, Kent, England
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Posted: Wed Nov 28, 2012 11:10 am Post subject: |
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Brilliant Bernhard.
I will share this with others...
Thank you. |
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BeeBuzz Foraging Bee

Joined: 07 Oct 2010 Posts: 111 Location: N. Wales, UK
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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biobee Site Admin

Joined: 14 Jun 2007 Posts: 1059 Location: UK, England, S. Devon
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Posted: Wed Oct 16, 2013 2:35 pm Post subject: |
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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Posted: Thu Oct 17, 2013 8:06 pm Post subject: |
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http://link.springer.com/article/10.1007%2Fs13592-013-0199-4
Sublethal doses of imidacloprid decreased size of hypopharyngeal glands and respiratory rythm of honeybees in vivo
In order to create warmth carbohydrates and oxygen are needed. Thus a disorder of the respiration means a disorder of the heat balance of the Bien. What are the consequences? |
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Che Guebuddha Golden Bee

Joined: 31 Jan 2012 Posts: 1551 Location: Hårlev, Stevns Kommune, Denmark
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Posted: Thu Oct 17, 2013 8:27 pm Post subject: |
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Winter loss?
F.....n pesticides! Big time to fight back this ignorant system we live in! |
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Garret Golden Bee

Joined: 04 Apr 2009 Posts: 1681 Location: Canada, BC, Delta
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Posted: Thu Oct 17, 2013 11:35 pm Post subject: |
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Presentation at the 2013 American Beekeeping Federation by Dr Jim Frazier of Penn State:
We are focusing on synergistic and sublethal effects of multiple pesticides on the chemical senses and chemically mediated behaviors of honeybees in relation to honeybee health and CCD in collaboration with Chris Mullin and Maryann Frazier. Graduate student Daniel Schmehl is also looking at a comparative approach with the solitary bee, Osmia cornifrons.
http://abfnet.org/associations/10537/files/Dr.%20Jim%20Frazier.mp3 _________________ I'm not as serious as I look! |
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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Posted: Fri Mar 27, 2015 12:11 am Post subject: |
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This study went over three years:
Quote: | Diseases and pest species did not affect colony health but infestations of Varroa mites were significantly higher in exposed colonies. Honey stores indicated that exposed colonies may have avoided the contaminated food. Imidacloprid dose effects was delayed later in the summer, when colonies exposed to 20 and 100 μg/kg experienced higher rates of queen failure and broodless periods, which led to weaker colonies going into the winter. Pooled over two years, winter survival of colonies averaged 85.7, 72.4, 61.2 and 59.2% in the control, 5, 20 and 100 μg/kg treatment groups, respectively. Analysis of colony survival data showed a significant dose effect, and all contrast tests comparing survival between control and treatment groups were significant, except for colonies exposed to 5 μg/kg. |
from: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0118748
Assessment of Chronic Sublethal Effects of Imidacloprid on Honey Bee Colony Health
Galen P. Dively1*, Michael S. Embrey1, Alaa Kamel2, David J. Hawthorne1, Jeffery
S. Pettis3
published 18.3.2015
Complete study as PDF-download: http://journals.plos.org/plosone/article/asset?id=10.1371/journal.pone.0118748.PDF |
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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Posted: Fri Apr 10, 2015 9:06 am Post subject: |
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On a German beekeeper and scientist convention the following has been presented. Some studies on neonics and varroa. Findings:
- Insecticides affect the population dynamics of mites!
- Insecticides cause stress!
- Significant effects in the fall if varroa + pesticides
- varroa load is higher in the A and B group (which was fed with sublethal doses of neonics
- Feeding of neonicotinoids leads to the reduction of hemocytes.
- Neonics affect wound closure (wound may not heal well).
- For thiacloprid this effect occurs only after high doses. For Clothianidin the effects occur after low doses
Original document (in German)
http://imker.cwsurf.de/index.php/downloads/category/3-dokumente?download=5:tagung |
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Che Guebuddha Golden Bee

Joined: 31 Jan 2012 Posts: 1551 Location: Hårlev, Stevns Kommune, Denmark
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Posted: Sat Apr 11, 2015 6:22 am Post subject: |
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How does it effect the varroa population? I wonder if varroa gets more virulent thanks to the pesticides?
There is so much proof that pesticides and mono crop agriculture are causing bee decline yet our overpaid politicians do nothing!
In Denmark they will by 2020 protect 20.000 hectares but I doubt they will do so in my locality. |
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zaunreiter Moderator Bee

Joined: 26 Nov 2007 Posts: 3097 Location: Germany, NorthWest
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catchercradle Golden Bee

Joined: 31 May 2010 Posts: 1550 Location: Cambridge, UK
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Posted: Thu May 05, 2016 2:27 pm Post subject: |
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Here in UK Che, politicians are worse than doing nothing but have given farmers a derogation allowing them to use neonics on Oil Seed Rape despite record harvests last year when they were not allowed to use it! |
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AndyC Scout Bee
Joined: 04 Jul 2014 Posts: 304 Location: Uk/Horsham/RH13
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Posted: Sat May 28, 2016 7:08 am Post subject: |
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The fact is here in the UK. government is in the pockets of big business and agri chemical profits are HUGE, so they will always do what they are told by the money men who own those businesses. |
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