Amid the perpetual debate surrounding Bt cotton ’s positive and negative impacts, a recent study titled — ‘ Long-term impact of Bt cotton: An empirical evidence from North India ’ — has said its adoption in Punjab in the past over a decade has resulted in net economic and environmental benefits.
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The research was funded by the Agricultural Extension Division of the Indian Council of Agricultural Research under extramural project “Impact evaluation of integrated pest management technologies”. The study was jointly done by the Punjab Agricultural University at Ludhiana, the Sher-e-Kashmir University of Agricultural Sciences and Technology in Jammu (SKUAST) and the Noida-based Amity University, and has been recently published in the Journal of Cleaner Production Elsevier.
“Since the commercialisation of Bt cotton, there has been reduction in insecticide use by volume and applications, decline in environmental and human health impact associated with insecticide use, more so with the reduction in the use of highly hazardous and riskiest insecticides, and reduction in the expenses associated with insecticide use. Also, cotton yields in the past 13 years have been stable, the only exception being 2015. Yet over the past 13 years, pesticide use has gradually increased in Bt hybrids and reduced in non-Bt varieties, primarily driven by the use of fungicide, which was not applied in cotton in 2003 and 2004.
“Akin to the discovery of synthetic pesticides in the 1940s, which was proclaimed as ‘silver bullet technology’ by entomologists, the complete reliance on Bt cotton without incorporating it into the integrated pest management (IPM) system led to outbreak of whitefly in northern India and pink bollworm in western India in 2015; thus, resistance to Bt cotton is yet to become a significant problem. Compatibility of Bt with IPM is not a given when we have weaker institutional setting with ad hoc IPM system and the contrarian view that Bt cotton has been a failure in India, in this case Punjab, lacks empirical evidence,” professor Rajinder Peshin of SKUAST told The Hindu .
Bt (Bacillus thuringiensis) cotton has been commercially grown in India for the past 19 years. The Genetic Engineering Approval Committee (GEAC) approved the release of Bt cotton for commercial cultivation in 2002 in western and southern parts of the country. In Punjab, Bt cotton was released for cultivation in 2005. Before the release, it was adopted by 72% farmers on 22% of the cotton area. However, a lot of questions have been raised recently on its impact.
“To find out the long-term socio-economic and environmental impacts of Bt cotton cultivation on cleaner production, we revisited cotton growers surveyed in 2003 and 2004 again in 2016-17. Before-after, with-without, and difference-in-differences [with and without sample attrition] within farm comparisons were analysed to find the impact of Bt cotton over time. Our results show that sucking insect pests have replaced bollworms as the key pests.
Decline in insecticide applications
“There has been a steep decline in insecticide applications to control bollworms, the target pest of Bt cotton, by 97%; however, this has been offset by an increase in the insecticide application by 154% to control sucking pests. Moreover, the increase in pesticide use was driven by the use of fungicides, which were not applied in cotton earlier, and increased use of herbicides.
“Our results show overall positive impact of Bt cotton on volume of insecticide active ingredients (a.i.) applied, insecticide applications, use of highly hazardous and riskiest insecticides, and resultant environmental impact of the field use of insecticides on cotton. Yields have stabilised after the commercialisation of Bt cotton,” said Mr. Peshin.
Published - June 21, 2021 07:34 pm IST
