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  1. #1
    Join Date
    Feb 2005
    Location
    Bonn Koenigswinter
    Posts
    29

    Default CCD: Risk prfile of neonicotinod Pesticides like Clothianidin and Imidacloprid

    Dear fellow beekeepers,

    on Frebruary 16, 2011, the dutch toxicologist Dr. Henk Tennekes gave a lecture at the Institute of Public Health, University of Heidelberg (Germany). This lecture is about "Toxicity as function of exposure time - Risk profile of neonicotinoid insecticides".

    It was originally given in german, but yesterday I visited him to record an english version of his lecture for the international beekeeping community.

    You can see and listen to this video on youtube:

    http://www.youtube.com/watch?v=M4RIDWuCN-A

    Greetings from Germany,

    Klaus
    Last edited by Klaus Maresch; 02-25-2011 at 01:30 AM. Reason: insecticides clothianidin imidacloprid pesticides

  2. #2
    Join Date
    Jan 2010
    Location
    Stromness, Scotland
    Posts
    124

    Default Re: CCD: Risk prfile of neonicotinod Pesticides like Clothianidin and Imidacloprid

    That is very interesting, unfortunatey the quaility of the video is poor.
    For those who don't have the patience to watch the whole video I have copied the page with the conclusions (from 25:41):
    Conclusions:

    The mode of action of neonicotinoid insecticides derives from almost complete and virtually irreversible blockage of postsynaptic nicotinic AcetylCholine-Receptors (nAChRs) in the central nervous system of insects.

    The toxicity of neonicotinoids to arthropods is reinforced by exposure time. Their dose : response characteristics are strikingly similar to those of carcinogens. Thus, there may not be a safe level of exposure.

    Imidacloprid is persistent and mobile in soil and prone to leaching.

    The contamination of surface water with imidacloprid is massive in some parts of Holland.

    Of the 13 components of agricultural intensification, only the use of insecticides and fungicides had consistent negative effects on biodiversity (wild plant, carabid and bird species).

    Surface water contamination with Imidacloprid correlates with reduced Diptera (Flies and Midges) abundance.

    Strong decline of butterflies since the introduction of neonicotinoid insecticides.

    Many invertebrate-dependent bird species (in very different habitats) are declining, some are now extinct.
    If you want to just watch the essence of the talk rather than an extended chemistry lession, I recommend listening from 12:20, when he gets to the biological implications for insects and birds.

    http://www.youtube.com/watch?v=M4RIDWuCN-A

    So, as there 'may not be a safe level of exposure' to neonicotinoids, what are we going to do?

  3. #3
    Join Date
    Mar 2009
    Location
    Poplar Bluff, Missouri, USA
    Posts
    2,308

    Default Re: CCD: Risk prfile of neonicotinod Pesticides like Clothianidin and Imidacloprid

    Great. Just great. s
    "If all you have is a hammer, the whole world is a nail." - A.H. Maslow

  4. #4
    Join Date
    Jul 2010
    Location
    Ozark, Ar
    Posts
    76

    Default Re: CCD: Risk prfile of neonicotinod Pesticides like Clothianidin and Imidacloprid

    Thank You for posting.

  5. #5
    Join Date
    Feb 2005
    Location
    Bonn Koenigswinter
    Posts
    29

    Default Re: CCD: Risk prfile of neonicotinod Pesticides like Clothianidin and Imidacloprid

    A pdf of this lecture is available here:

    http://bit.ly/gUTFIG

    Greetings, Klaus

  6. #6
    Join Date
    May 2009
    Location
    Grand Rapids MI USA
    Posts
    347

    Default Re: CCD: Risk prfile of neonicotinod Pesticides like Clothianidin and Imidacloprid

    As a 3yr bk I really wasn't interested in the neonics. But when a 20yr plus master bk I know just lost two yards (16 hives), something is going on.
    It's my understanding these hives were July starts w/ fresh queens, no pesticides, etc. Sure is bizarre that most all the hives died w/o explaination that he can find eh?
    Thanx for posting

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