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Posted by dpb on September 22, 2007, 12:14 am
Steve Barker LT wrote:
> roundup kills by smothering the plant from the top. It only works when
> sprayed on the green part.
...
Not true in either assumption. It normally is sprayed on growing
vegetation, but if in contact with roots, it will be taken up by the
plant and kill it. It doesn't move in the soil widely so is not an
effective sterilant or pre-emergent, but will be effective in in contact
with the roots themselves.
Glyphosate works by disrupting the EPSP synthase enyzme which is key in
the production of amino acids essential to plant growth, not by
"suffocating" the plant. It is classified as a broad-spectrum,
non-selective herbicide, active on most species of green plants.
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