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Farmers use as much pesticide with GM crops, US study finds



 
 
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Old July 27th, 2006, 02:31 PM posted to rec.travel.europe
Leffe
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Default Farmers use as much pesticide with GM crops, US study finds

Farmers use as much pesticide with GM crops, US study finds

By Steve Connor, Science Editor
Published: 27 July 2006

One of the major arguments in favour of growing GM crops has been
undermined by a study showing that the benefits are short-lived because
farmers quickly resort to spraying their fields with harmful
pesticides.

Supporters of genetically modified crops claim the technique saves
money and provides environmental benefits because farmers need to spray
their fields fewer times with chemicals.

However, a detailed survey of 481 cotton growers in China found that,
although they did use fewer pesticides in the first few years of
adopting GM plants, after seven years they had to use just as much
pesticide as they did with conventional crops.

The study found that after three years, the GM farmers had cut
pesticide use by 70 per cent and were earning over a third more than
conventional farmers.

But, by 2004, the GM cotton farmers were using just as much pesticide
as their conventional counterparts and were spending far more because
GM cotton seed is three times the price of conventional cotton seed.

The findings will undermine claims by the biotechnology industry that
GM technology can boost food production without necessarily damaging
the environment with pesticides.

Scientists from Cornell University in Ithaca, New York, carried out the
study which involved interviews with hundreds of Chinese farmers who
had switched to cotton that had been genetically modified with a gene
for a bacterial toxin.

The toxin - known as Bt - is secreted by the GM cotton plant and is
highly effective at stopping the growth of bollworm, a major pest of
the crop that can cause millions of pounds worth of damage.

Major cotton producers, the United States, China, India and Argentina,
quickly adopted Bt cotton after it was introduced in 1996 by Monsanto,
the American biotechnology company.

Today, more than a third of the global cultivation of cotton is
accounted for by Bt cotton, ranging from 42.8 million hectares in the
United States to 3.7 million hectares in China.

Before the introduction of the GM crop into China, farmers in the
country had to spray on average 20 times each growing season to control
bollworm but, with Bt cotton, the average number of treatments fell to
below seven.

The amount of pesticide also fell by 43.3kg per hectare in 1999, which
was a decrease of about 71 per cent on previous years.

However, Professor Per Pinstrup-Andersen and his colleagues at Cornell
found that all those benefits have since been largely lost due to the
rise of other pests that were not considered a problem for cotton.

"Using a household survey from 2004, seven years after the initial
commercialisation of Bt cotton in China, we show that total pesticide
expenditure for Bt cotton farmers in China is nearly equal to that of
their conventional counterparts," the scientists say in their report.

"Bt farmers in 2004 on the average have to spray pesticide 18.22 times,
which is more than three times higher compared with 1999.

"Detailed information on pesticide expenditures reveals that, though Bt
farmers saved 46 per cent of bollworm pesticide relative to non-Bt
farmers, they spend 40 per cent more on pesticides designed to kill an
emerging secondary pest," they say.

Secondary pests, such as a type of leaf bug called mirids, are not
normally a problem in cotton fields because bollworm, and sprays
against bollworm, tend to keep them in check.

However, because Bt cotton is targeted mainly against bollworm, other
pests are able to exploit the relatively low use of pesticide that such
fields need.

"These results should send a very strong signal to researchers and
governments that they need to come up with remedial actions for the
Bt-cotton farmers, otherwise these farmers will stop using Bt cotton
and that would be very unfortunate," Professor Pinstrup-Andersen said.

One of the major arguments in favour of growing GM crops has been
undermined by a study showing that the benefits are short-lived because
farmers quickly resort to spraying their fields with harmful
pesticides.

Supporters of genetically modified crops claim the technique saves
money and provides environmental benefits because farmers need to spray
their fields fewer times with chemicals.

However, a detailed survey of 481 cotton growers in China found that,
although they did use fewer pesticides in the first few years of
adopting GM plants, after seven years they had to use just as much
pesticide as they did with conventional crops.

The study found that after three years, the GM farmers had cut
pesticide use by 70 per cent and were earning over a third more than
conventional farmers.

But, by 2004, the GM cotton farmers were using just as much pesticide
as their conventional counterparts and were spending far more because
GM cotton seed is three times the price of conventional cotton seed.

The findings will undermine claims by the biotechnology industry that
GM technology can boost food production without necessarily damaging
the environment with pesticides.

Scientists from Cornell University in Ithaca, New York, carried out the
study which involved interviews with hundreds of Chinese farmers who
had switched to cotton that had been genetically modified with a gene
for a bacterial toxin.

The toxin - known as Bt - is secreted by the GM cotton plant and is
highly effective at stopping the growth of bollworm, a major pest of
the crop that can cause millions of pounds worth of damage.

Major cotton producers, the United States, China, India and Argentina,
quickly adopted Bt cotton after it was introduced in 1996 by Monsanto,
the American biotechnology company.

Today, more than a third of the global cultivation of cotton is
accounted for by Bt cotton, ranging from 42.8 million hectares in the
United States to 3.7 million hectares in China.

Before the introduction of the GM crop into China, farmers in the
country had to spray on average 20 times each growing season to control
bollworm but, with Bt cotton, the average number of treatments fell to
below seven.

The amount of pesticide also fell by 43.3kg per hectare in 1999, which
was a decrease of about 71 per cent on previous years.

However, Professor Per Pinstrup-Andersen and his colleagues at Cornell
found that all those benefits have since been largely lost due to the
rise of other pests that were not considered a problem for cotton.

"Using a household survey from 2004, seven years after the initial
commercialisation of Bt cotton in China, we show that total pesticide
expenditure for Bt cotton farmers in China is nearly equal to that of
their conventional counterparts," the scientists say in their report.

"Bt farmers in 2004 on the average have to spray pesticide 18.22 times,
which is more than three times higher compared with 1999.

"Detailed information on pesticide expenditures reveals that, though Bt
farmers saved 46 per cent of bollworm pesticide relative to non-Bt
farmers, they spend 40 per cent more on pesticides designed to kill an
emerging secondary pest," they say.

Secondary pests, such as a type of leaf bug called mirids, are not
normally a problem in cotton fields because bollworm, and sprays
against bollworm, tend to keep them in check.

However, because Bt cotton is targeted mainly against bollworm, other
pests are able to exploit the relatively low use of pesticide that such
fields need.

"These results should send a very strong signal to researchers and
governments that they need to come up with remedial actions for the
Bt-cotton farmers, otherwise these farmers will stop using Bt cotton
and that would be very unfortunate," Professor Pinstrup-Andersen said

 




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