Re:eradicating vines/roundup

>
>The mechanism for killing by roundup is interesting.  Roundup inhibits the
>synthesis of three amino acids, phenylalanine, tyrosine and tryptophan.
>These amino acids are needed for protein synthesis by the plant.  When
>synthesis of these amino acids is inhibited protein synthesis stops and
>killing occurs.  The site of synthesis is mainly leaf chloroplasts, so of
>course spraying the leaves gives the best effect.  The other interesting
>things are that animals do not synthesize these amino acids (we must get
>them in our diet) so roundup is not toxic to animals and humans and soil
>microorganisms break down roundup rather quickly-it has a short half life.
>
>Howard Zalkin

Thanks Howard,that is the clearest explanation I've yet heard about the
mechanism by which Roudup works.  Makes a bunch of sense to me.   Also
explains why it is not toxic to animals (inc humans).  What is the source
of this info?

Nan
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Nan Sterman
San Diego County California
Sunset zone 24, USDA hardiness zone 10b or 11

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