In article ,
says...

"Rusty Hinge 2" wrote in message
k...
The message
from Fuschia contains these words:
On Tue, 8 Jul 2008 16:04:56 +0100, Rusty Hinge 2
wrote:
The message
from "Emrys Davies" contains these words:

I know how glyphosate works on a plant and the soil but I am
wondering
if it is safe in the following circumstances:

If it is applied to weeds on concrete paths, allowed to
completely dry
and then it rains is there a danger that the residue can then be
carried
on shoes onto grassed areas and thus cause damage?

No. Once in the soil it becomes locked-in and harmless.

Incidentally, on the Farming Programme recently (IIRC) I heard a
farmer
refer to it repeatedly as 'glyphosphate'...

The OP did say it was on concrete paths rather than on soil, but I
think the answer will be the same because having dried out and then
been further diluted by rain it will be very much weakened.

It will be the same: if it doesn't form a (triangular) bond with the
actual concrete, as soon as it is washed into the soil, it will bond
with that and become harmless.

What about the grass with which it comes into contact before it reaches
the soil. Would you kindly confine your remarks to Glyphosate which has
dried on concrete, has subsequently been wetted by rain, then trodden on
by shoes which in turn have then trodden on grass?

Regards,
Emrys Davies.



Whether or not it is technically possible for the weedkiller to
reactivate it does not do so, and when used as you discribe it will not
damage your grass
--
Charlie Pridham, Gardening in Cornwall
www.roselandhouse.co.uk
Holders of national collections of Clematis viticella cultivars and
Lapageria rosea