ISIS Report 28/11/11
Monsanto Defeated by Roundup Resistant Weeds
explosion of glyphosate resistant weeds forces Monsanto to run away from farmers’
rising weed control costs Dr Eva Sirinathsinghji
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Monsanto is surrendering to glyphosate resistant weeds ,
according to a new briefing by UK based GM freeze. They are spreading at
‘exponential’ rates in US farms and are increasingly documented in Australia, Argentina, Brazil, Chile, Europe and South Africa.
While Monsanto grandly claims that its GM
technologies help the environment by reducing pesticide use, resistant weeds springing
up across the world paints a different picture. Glyphosate resistance has developed
as the result of large-scale use of their pesticides. Glyphosate
is the active ingredient of Monsanto’s world best-selling herbicide, Roundup.
And now, Monsanto aims to combat this serious
agronomic, environmental, socio-economic, and health problem with even further
increases in pesticide use.
The company is refusing to accept responsibility
for rising weed costs, stating that  “Roundup agricultural warranties will
not cover the failure to control glyphosate resistant weed
populations.” Rising costs are burdening farmers across the globe.
This is in contrast to two years ago, when Monsanto denied the
scale of the problem and insisted the weeds were “manageable”. By 2009, the
spread of resistant weeds was already troubling farmers as they escalated the amounts
of glyphosate used, while adding other herbicides to try and control rapidly
proliferating weeds (see
 GM Crops Facing
Meltdown in the USA, SiS 46). Sixteen glyphosate-resistant
species had already developed by this point, many of which could not be killed
or even uprooted by combine harvesters due to their size and strength. Resistant
weeds are not a new problem, but Monsanto is only now coming to terms with the
severity and the subsequent harm it may do to their business.
The GM freeze briefing covers findings for the 2010/2011
season so far, documenting two new species of resistant weeds, as the global
total reaches 21 species, including two of the most destructive pests: Common
Waterhemp (Amaranthus tuberculatus) and Palmer Amaranth (Amaranthus
palmeri), that are infesting cotton and maize fields alike .
Resistant weeds so far
cover over 4.5 million hectares in the US alone, while world-wide coverage is
thought to have reached at least 120 million hectares by 2010. The US has the worst problem, with 13 different species in 73 different locations. Palmer
amaranth now infests over 1 million separate sites in North Carolina alone,
while Horseweeds have infested 100,000 sites in Delaware. In Argentina, 100,000 acres of soya crop lands is now infested with Johnson Grass.
The lack of glyphosate resistant weeds prior to the
introduction of RR (Roundup Ready) crops genetically modified to tolerate
glyphosate, led GM proponents to argue that glyphosate resistance would not be
a likely problem following the introduction of RR crop farming. However, since
their commercialisation in 1996, resistant weed species have been emerging at a
rate of 1 per year. Most worryingly, the spread of resistant weeds seems to be
increasing dramatically. Up until 2003, 5 resistant populations had been
documented. Since 2007, there has been a 5-fold increase in the spread of
Resistance to glyphosate has been studied in numerous
laboratories, and research is beginning to enlighten us to the mechanism of
resistance, and has shown that different mechanisms have developed in separate
populations of Palmar Amaranth. This suggests that resistance
is not due to the spread of resistant seeds from one population to another, but
instead, can develop spontaneously wherever glyphosate is overused, as some
scientists have long predicted based on past experience (see  Genetic Engineering Dream or Nightmare, ISIS
The cause of glyphosate resistance is primarily the farming
of glyphosate tolerant RR crops, which increases the use of pesticides on
fields. This introduction of RR crops has destroyed previous farming practices
that kept weeds at bay. Crop rotation, pesticide rotation as well as tillage of
soils are no longer practiced on GM farms, and with the emergence of glyphosate
resistant weeds, Monsanto’s solution so far has been to douse plants in ever
increasing amounts of Roundup. These practices have resulted in what the
director of Cotton Incorporated, Robert Nicols has described as “an exponential
spread of resistance” . Ever increasing amounts of glyphosate serves only to
increase the virulence of resistance in weed populations.
Monsanto want to increase herbicide use
Einstein famously quoted, ‘no problem can be solved with the same consciousness
that created it’. That is precisely what Monsanto is doing: advocating more and
more herbicides to be used. New guidance published by the company to manage
use of a cocktail of pesticides including 2,4-D, prior to sowing crop seeds
production of GM seeds expressing tolerance to more than one pesticide. DuPont
has already commercialised seeds tolerant to glyphosate and glufosinate.
Monsanto has recently announced an agreement with the German pesticide and
biotechnology company BASF to develop crops stacked with glyphosate and
dicamba tolerant genes
use of herbicides that remains active in the soil, killing any seedlings as
they germinate, including sulfentrozone
consequences of increasing herbicide use are likely to put the environment and
people at further risk. Glyphosate has been shown to damage soil fertility, the
crops themselves, human health as well as off-target organisms (see [7,8] Scientists Reveal
Glyphosate Poisons Crops and Soil, SiS EU
Regulators and Monsanto Exposed for Huding Glyphosate Toxicity, SiS 51).
Weed resistance leaves Monsanto in a tricky spot. Farmers
are now seeking alternative seeds even though Monsanto have a large control
over the seed market, and prospective sales of glyphosate, the biggest selling
herbicide in the world, are beginning to look uncertain. Rival companies have
already developed alternative GM-herbicide systems and others are in the
pipeline. Monsanto has now started collaborating with companies to create seeds
that express tolerance to other herbicides.
solutions to weed resistance
GM freeze briefing highlights an alternative, herbicide-free solution to the
problem of weed resistance that relies on an organic/agroecological approach. These
- Vigilance and quick control of resistant populations
rotation and avoidance of monoculture forces different weed
populations and densities thus preventing the establishment of a resistant
- Crop breaks – fallow or temporary grazing systems
- Mechanical weeding
crops to pull isolated weeds to prevent them
soil to kill weed seedlings
using cover crop or weed residues to reduce weed populations
Glyphosate resistant weeds are destroying crop fields, causing
significant agronomic and economic problems for farmers. This cannot be solved
through the increased use of herbicides that will further impact human and
environmental health, but only with organic/agroecological methods that free
farmers from the industrial, monoculture farming that got them into the problem
in the first place (see  Food
Futures Now: *Organic *Sustainable *Fossil Fuel Free , ISIS publication).
There are 6 comments on this article so far. Add your comment
|Eva Sirinathsinghji Comment left 30th November 2011 18:06:49|
There is a great database documenting herbicide resistant weeds across the globe called International Survey of Herbicide Resistant Weeds.
|Peter Brenton Comment left 29th November 2011 21:09:40|
I do wish all environmental NGOs drop their current campaigns for bit and band together against Monsanto and their partners in crime before we get to a point of no return.
|B.A. McClintock Comment left 30th November 2011 10:10:52|
You made reference to 73 different locations in the US. Where may we find those locations printed?
|Sharon Muczynski Comment left 30th November 2011 10:10:48|
More than any other environmental calamity this one concerns me. Adding more potent herbicides is just stupid.
|Susana Green Comment left 1st December 2011 08:08:15|
The company Monsanto is EVIL and needs to be STOPPED!!
|Jodi james Comment left 8th December 2011 10:10:52|
Well well well monsanto you have certainly caused a problem with nature fiddling with natural plants, now Australia are filling the trend, you think they would do their own research on damaging companies who want to control farmers and damage the food chain! You will pay eventually, let's hope it's sooner rather than later. The only problem is it will be the next generation that pays.