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Subject:
From:
Peter Dillon <[log in to unmask]>
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Date:
Tue, 1 Jul 2003 19:54:45 +0100
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Observing the growth rate that appears to have occurred in certain areas of France this year, I pose
this for thought:
Systemic insecticides are applied to plant tissue to be active for a specified period of time -
after which it is deemed that they are either not present or have been transformed into a non active
form.
This allowing protected growth of a plant to occur, followed by un-tainted nectar flow and pollen
production.

This year sunflowers are flowering upto 3 weeks in advance of normal - growth rates allowing flower
formation to occur early.
Therefore, if a systemic product is deemed to be active for 60 days, but now flowering is occurring
in a period that is shorter than the 60 days - what is the consequence on "the label" for the
insecticide? - presuming that the active material should not be present during the flowering period!

What controls the length of time a systemic product is present in a plant?
1. The metabolic processes occurring in a plant, or
2. A plain and simple number of days from application.

If global warming is resulting in plants arriving at flowering stage in shorter time periods, the
relationship between this and insecticide activity "time slots" will have to be viewed very
carefully.
Spring planted rape/canola would be a prime candidate for careful observation.
Any thoughts?
Regards,
Peter

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