Monday, December 20, 2010


Bt cotton boosting pesticide use

Tuesday, 16 February 2010 14:02


NOTE: GM lobbyists have tried to paint Bt cotton in India as a massive success story that's cut insecticide use and boosted productivity. Now Keshav Kranthi, a leading Indian entomologist and acting director of India's Central Institute of Cotton Research (CICR)] has told the Indian government that the rapid adoption of GM cotton by farmers across the country has coincided with:

*the rise of hitherto unknown insect pests

*increased pesticide applications by farmers

*declining cotton productivity over the past three years

The picture of what's been happening in India emerging from the research of this pro-GM scientist, ties in with the findings of research in China (also undertaken by GM supporters) which showed that seven years after the commercialization of Bt cotton there, the expenditure on pesticides by Bt cotton farmers was more or less the same as for conventional (non-GM) growers, despite the extra expenditure the Bt farmers were making on GM seeds in order to reduce (supposedly) their need to spray.

In India the picture appears to be even worse with pesticide applications on Bt cotton significantly overtaking those on conventional cotton.

EXTRACT: Kranthi says 90 per cent of the current GM cotton hybrids appear susceptible to mealybugs and whiteflies. Insecticide use in cotton appears to have increased from Rs 640 crore [6,400,000 rupees] in 2006 to Rs 800 crore [8,000,000 rupees] in 2008, his report said.
Cotton lessons for Bt brinjal
The Telegraph, February 15 2010

New Delhi: Crop scientist Keshav Kranthi would hate being labelled campaigner against genetic engineering. He says he supports plant biotechnology and wants India to pursue the myriad promises it offers.

But in the polarised debate on the genetically modified (GM) brinjal, Kranthi has aligned himself with groups calling for caution before its release, citing little-known but serious trouble with cotton rarely articulated before.

Kranthi, acting director of the Central Institute of Cotton Research (CICR) in Nagpur, has warned that poor management of the technology has spawned an abundance of predictable and unexpected problems. The rapid adoption of GM cotton by farmers across the country has coincided with the rise of hitherto unknown insect pests, increased pesticide applications by farmers, and declining cotton productivity over the past three years, he has told the government.

Indian regulators approved GM cotton engineered with a bacterial gene to resist an insect — based on technology similar to that in GM brinjal — in 2002. Kranthi asserts there are no scientifically-authenticated safety issues over GM cotton from anywhere.

Farmers have adopted the GM cotton, which now makes up 90 per cent of the crop in some areas, and virtually eliminated its target pest — bollworms. India's annual cotton output has jumped from 3 billion kg to 5.3 billion kg over the past decade.

But new insects, including one called a mealybug, not known as cotton pests, have spread, causing significant economic losses, Kranthi said in a report sent to the ministry of environment and forests with his comments on GM brinjal.

"Cotton is a tricky crop - we should have been more careful," Kranthi said. "There are lessons to be learnt from this experience for future genetically modified crops, brinjal or anything else," he told The Telegraph.

The environment ministry last week imposed a moratorium on the release of GM brinjal that will remain in place until independent studies are able to establish its safety and there is scientific consensus that it can be released.

Many crop and biotechnology industry scientists have pitched yield and economic gains from GM cotton to farmers as striking examples of the fruits of biotechnology, arguing that GM brinjal would deliver similar benefits.

But a mealybug named Phenacoccus solenopsis, not observed earlier in India, has spread across northern, central and western states after it was first recognised as a cotton pest about five years ago, Kranthi said. In desperation, farmers have begun to spray "extremely hazardous" pesticides on the cotton to fight the insect, which has a waxy coating over its surface that makes it hard to kill with less toxic pesticides, he said.

The reduced use of pesticides on GM cotton and the proliferation of GM cotton hybrids that are susceptible to these insects may have contributed to the emergence of these pests, according to Kranthi's report. "The inappropriate choice of hybrids and the arbitrary and prolific spread of GM cotton hybrids have created conditions congenial for the rapid multiplication of these new insects."

Kranthi sees himself as an insider, a biotechnology believer, urging caution. "Someone has to point this out," said Kranthi, a 47-year-old entomologist who had articulated similar concerns five years ago in the journal Current Science from the Indian Academy of Sciences.

But other scientists disagree with him. “He’s wrong on this. New insect pests always overtake old ones. This could be part of a natural cycle that has nothing to do with GM cotton,” said Thirkannad Manjunath, a senior entomologist who has worked with both government and private crop science institutions.

Another scientist who heads a private biotechnology company said the emergence of new pests was not surprising. “The significantly reduced use of pesticide sprays would have allowed these (non-bollworm) insects to multiply,” said K.K. Narayanan, who is also a member of the Association of Biotechnology-Led Enterprises. “We’ve always maintained that genetic modification (of plants) is only part of a package of crop management practices.”

But Kranthi says 90 per cent of the current GM cotton hybrids appear susceptible to mealybugs and whiteflies. Insecticide use in cotton appears to have increased from Rs 640 crore in 2006 to Rs 800 crore in 2008, his report said.

The report also points out that seed companies have produced over 600 GM cotton hybrids, and farmers in cotton-growing districts find themselves having to choose from 150 to 200 hybrids. Yet India’s cotton productivity has declined over the past three years — from 560kg lint per hectare in 2007 to 520kg lint in 2008 to 512 kg lint in 2009. A wrong choice of hybrids, Kranthi said, may be contributing to this drop. “A wise choice of GM cotton hybrids which are tailored for geographical regions after taking into account their susceptibility to other pests may have led to much better outcomes.”

Some scientists point out that mandatory state and district-level technical committees for crop genetic engineering that could have guided the appropriate choice of hybrids are missing in many states. “The hybrids used depend on farmers, seed suppliers and university extension centres,” said C. Kameswara Rao, director of the Foundation for Biotechnology Awareness and Education in Bangalore. “This has nothing to do with GM cotton or approvals,” he said.

Bt cotton boosting pesticide use in China



"Seven years after the initial commercialization 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, about $101 per hectare.

Bt farmers in 2004 on the average, have to spray pesticide 18.22 times, which are more than 3 times higher compared with 6 times pesticide spray in 1999. Detailed information on pesticide expenditures reveals that, though Bt farmers saved 46% Bollworm pesticide relative to non-Bt farmers, they spend 40% more on pesticides designed to kill an emerging secondary pest. These secondary pests (one example is Mirid) was rarely found in the field prior to the adoption of Bt cotton, presumably kept in check by bollworm populations and regular pesticide spraying. The extra expenditure needed to control secondary pests nearly offsets the savings on primary pesticide frequently cited in the current literature."

Study link: Tarnishing Silver Bullets: Bt Technology Adoption, Bounded Rationality and the Outbreak of Secondary Pest Infestations in China (Shenghui Wang, David Just, Jul-2006)

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