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  • From: "Lawrence F. London, Jr." <venaurafarm@bellsouth.net>
  • To: permaculture <permaculture@lists.ibiblio.org>
  • Subject: [permaculture] Fw: Glyphosate Resistance in Weeds
  • Date: Wed, 03 Mar 2010 14:20:18 -0500


----- Original Message -----
From: <press-release@i-sis.org.uk>
To: <sals3@cox.net>
Sent: Wednesday, March 03, 2010 7:34 AM
Subject: Glyphosate Resistance in Weeds


The intended recipient for this message is sals3@cox.net
The Institute of Science in Society
Science Society Sustainability
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This article can be found on the I-SIS website at
http://www.i-sis.org.uk/glyphosateResistanceTransgenicTreadmil.php

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========================================================
ISIS Report 03/03/10

Glyphosate Resistance in Weeds
########################

The Transgenic Treadmill

Glyphosate resistant weeds may spell the end of patented
herbicide tolerant crops, but can farmers exit the
transgenic treadmill that's very profitable for Monsanto?
Prof. Joe Cummins

An evolving problem

Glyphosate herbicide was patented and sold by Monsanto
corporation since 1974 under the trade name and proprietary
formulation Roundup. The herbicide has been used widely in
agriculture, forestry, aquaculture, alongside roads and
highways, and in home gardening. Glyphosate is a broad-
spectrum herbicide that poisons many plant species so it is
frequently used to 'burn down' weeds on a field prior to the
planting or emergence of crops.

Before 1996, weeds were not observed to have evolved
resistance to glyphosate in the field, but since then, the
introduction of transgenic glyphosate tolerant crops has led
to evolution of a number of resistant weeds as the result of
the greatly increased use of the herbicide particularly
during the post-emergent growth of the crops. Glyphosate
reisistant Asiatic dayflower (Commelina cumminus L) common
lambsquarters (Chenopodium album L) and wild buckwheat
(Polygonum convolvulus L) are reported to be increasing in
prominence in some agro ecosystems as are populations of
horseweed (Conyza canadensis (L) Cronq) [1].

In regions of the USA where transgenic glyphosate resistant
crops dominate, there are now evolved glyphosate-resistant
populations of the economically damaging weed species
Ambrosia artemissifolia (rag weed), Ambrosia trifida
L.(great ragweed), palmer pigweed (Amaranthus palmeri),
common water hemp (Amaranthus rudis) , rough fruit amaranth
(Amaranthus tuberculatus) and various Conyza (horse weed )
and Lolium (rye grass) species.

Likewise, in areas of transgenic glyphosate resistant crops
in Argentina and Brazil, there are now evolved glyphosate
resistant populations of Johnson grass (Sorghum halepense)
and Mexican fireplant (Euphorbia heterophylla) [2]. These
herbicide resistant weeds pose a clear threat to the
transgenic crops dominating North and South America [3].

Read the rest of this report here
http://www.i-sis.org.uk/glyphosateResistanceTransgenicTreadmil.php

Or read other articles about GM agriculture
http://www.i-sis.org.uk/GE-agriculture.php
========================================================
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