Sender: |
|
Date: |
Fri, 26 Apr 2013 21:40:31 -0300 |
Reply-To: |
|
Subject: |
|
MIME-Version: |
1.0 |
Message-ID: |
|
In-Reply-To: |
|
Content-Type: |
text/plain; charset=ISO-8859-1 |
From: |
|
Parts/Attachments: |
|
|
On Thu, Apr 25, 2013 at 10:51 PM, Peter L Borst <[log in to unmask]>wrote:
> Regarding treatment of citrus: My friend Jody Johnson studied IMI
> (imidacloprid) treated maple trees
>
That is an interesting study. How was the treatment applied? Do you know
at what rate?
> >Of the 108 water samples collected, 9 samples ranged from 7-131ppb
> (LD50=280ppb), and 14 samples were at the limit of detection by ELISA
> assay.
Who did the ELISA assay? I recently asked on this list and got only one
suggestion and when I contacted that lab they did not do ELISA testing for
pesticides. They suggested two other labs, but both of those were also
dead end leads.
> The red maple study revealed ranges of IMI in plant tissue of 0-53,300 ppb
> in leaves, 0-5440 ppb flowers, 0-32 ppb pollen, and 0 ppb in nectar,
> supporting evidence of predominantly xylem transport.
>
The leaf numbers above don't seem to relate to the number below
> > The results we found suggest that IMI is not a risk to honey bees
> through the pollen of red maples but the high concentration of IMI in red
> maple leaves may raise a different issue to honey bees. The concentrations
> of IMI at levels on the order of 103 ppb in leaves could be an exposure
> risk to honey bees if the concentrations were released from the leaves. One
> scenario for exposure is through the decomposition of leaves in pooled
> water that is visited by honey bees.
>
??The highest rate is way over the 103 ppb in leaves. Was 103 the average?
Similarly, 32 ppb in pollen is a lot, wonder what the average was. In
sunflowers in France it was rarely over 8 ppb. In canola it is usually
below 6 I think.
> Josephine Johnson. (2012) The role of pesticides on honey bee health and
> hive maintenance with an emphasis on the neonicotinoid, imidacloprid. PhD
> Dissertation
>
Was this ever published as part of a paper, or is it only available from
Ms. Johnson?
Stan
***********************************************
The BEE-L mailing list is powered by L-Soft's renowned
LISTSERV(R) list management software. For more information, go to:
http://www.lsoft.com/LISTSERV-powered.html
|
|
|