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Date: | Wed, 25 Apr 2012 10:18:17 -0400 |
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On 25-Apr-12, at 4:23 AM, Chris Slade wrote:
>
> The impression is given that a chemical is safe after the expiry
> of its half life and this may, in some cases, not be so.
>
Hi Chris and all
I think that the number of 'half-lifes' before the chemical is safe
is the important statement. Seven 'half-lifes' are needed to decay
to below 1%. With imidicloprid the half life is 3 hours to 444 days
depending on where it is found, water, clay, sand, etc, and who is
talking. I believe, like Stan, that retreating the same area again
before the chemical has depleted itself complicates the issue further.
Bob Darrell
Caledon Ontario
Canada
44N80W
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