Why in the News?

India’s cotton production has dropped by 25% over the last 10 years because of the pink bollworm. Some seed companies have created new genetically modified cotton varieties that can resist this pest, but government rules are delaying their approval and use.

Why has cotton output fallen despite Bt cotton’s earlier success?

• Resistance Development in Pests: The pink bollworm (PBW), a monophagous pest, developed resistance to Bt cotton toxins (cry1Ac and cry2Ab) over time. Eg: A study published in Nature showed PBW resistance by 2014, just 12 years after Bt cotton’s introduction.
• Pest Adaptability and Short Life Cycle: PBW’s short life cycle (25–35 days) allows multiple generations in one crop season, accelerating resistance buildup. Eg: In central India, PBW reached economic threshold levels by 2014, impacting yields.
• Yield Stagnation and Decline: The national average lint yield rose to 566 kg/ha in 2013–14 but has fallen to around 436–437 kg/ha in recent years. Eg: This drop mirrors increased pest pressure and reduced effectiveness of Bt technology.
• Increased Import Dependence: Falling domestic production has led to India importing more cotton than it exports. Eg: In 2024–25, imports are projected at 30 lakh bales vs exports of 17 lakh bales.
• Lack of New GM Approvals: Regulatory and political hurdles have stalled the approval of next-gen GM cotton hybrids resistant to PBW. Eg: No new GM cotton hybrid has been commercialised since Bollgard-II in 2006.

How has the pink bollworm turned India into a net cotton importer?

• Destruction of Cotton Bolls and Lint Quality: PBW larvae bore into cotton bolls, feeding on seeds and lint, reducing both yield and fibre quality. Eg: This led to a production drop from 398 lakh bales (2013–14) to just 294 lakh bales (2024–25 projected) — the lowest since 2008–09.
• Resistance to Bt Cotton: PBW developed resistance to the Bt toxins (cry1Ac and cry2Ab) used in GM cotton, making current hybrids ineffective. Eg: Resistance was first noted in central India around 2014, eventually spreading to southern and northern zones.
• Decline in Exports, Rise in Imports: As production fell and quality declined, exports dropped and imports surged. Eg: In 2024–25, India is expected to import 30 lakh bales but export only 17 lakh bales, reversing its earlier status as a net exporter.

Which new genetic technologies are Indian seed companies using to combat PBW resistance in cotton crops?

• Introduction of Novel Bt Genes: Companies are using Bt genes not previously deployed in India to overcome existing PBW resistance. Eg: Bioseed Research India is conducting trials with its ‘cry8Ea1’ gene-based hybrid under the proprietary BioCotX24A1 event.
• Use of Synthetic Bt Genes: Synthetic versions of Bt genes are engineered to enhance toxicity and overcome pest resistance. Eg: Rasi Seeds has developed hybrids expressing a synthetic cry1c gene for improved resistance to PBW.
• Deployment of Chimeric Bt Genes: Chimeric genes combine segments of multiple Bt genes to create a novel protein with broader insecticidal action.Eg: Ankur Seeds, in collaboration with NBRI, is trialing cotton hybrids using a chimeric Bt protein from Event 519.

When did the pink bollworm start crossing the economic threshold level in various cotton-growing zones of India?

• Central Zone (Maharashtra, Gujarat, Madhya Pradesh): PBW crossed the ETL around 2014, marking the beginning of widespread yield loss in the heartland of cotton production. Eg: Farmers in Maharashtra began reporting severe PBW damage post-2014 despite using Bt cotton.
• Southern Zone (Telangana, Andhra Pradesh, Karnataka, Tamil Nadu): The pest breached the ETL by 2017, affecting the second major cotton belt in the country. Eg: Telangana experienced major crop losses during the 2017–18 season due to PBW infestation.
• Northern Zone (Punjab, Haryana, Rajasthan): PBW reached ETL in the northern states by 2021, completing its spread across all major cotton-growing regions. Eg: In 2021, Haryana reported pink bollworm infestation even in previously unaffected areas.

How are regulatory hurdles affecting the commercialisation of new GM cotton hybrids in India?

• Lengthy Approval Process: Multi-stage field trials (event selection, BRL-1, BRL-2) take years before commercial approval is granted. Eg: Bioseed’s ‘cry8Ea1’ GM cotton is still in BRL-1 trial phase, needing further years of testing before release.
• Lack of New GM Approvals Since 2006: No new GM cotton hybrid has been approved for commercial cultivation since Monsanto’s Bollgard-II in 2006. Eg: Despite several companies developing PBW-resistant varieties, commercialisation remains stalled.
• Opposition from States and Activist Groups: State-level permissions and activist resistance delay or block field trials, affecting research and rollout. Eg: Rasi Seeds and Ankur Seeds await approvals for first-year trials amid regulatory scrutiny and local objections.

Way forward: 

• Accelerate Regulatory Approvals for Next-Gen GM Cotton: The government should streamline and fast-track the approval process for new GM hybrids with novel, synthetic, or chimeric Bt genes to restore cotton productivity and pest control efficacy. Eg: Timely clearance of Bioseed’s cry8Ea1 and Rasi’s synthetic cry1c cotton hybrids can help tackle PBW resistance.
• Promote Integrated Pest Management (IPM) and Farmer Awareness: Combine genetic solutions with IPM strategies—crop rotation, pheromone traps, and timely pesticide use—to delay resistance buildup. Launch nationwide farmer education programs on early detection and field hygiene. Eg: Maharashtra’s IPM pilot schemes have shown promise in reducing PBW infestations when practiced consistently.

Mains PYQ:

[UPSC 2021] What are the present challenges before crop diversification? How do emerging technologies provide an opportunity for crop diversification?

Linkage:  Vulnerability of a monoculture system relying heavily on Bt cotton, crop diversification could be a strategy to reduce dependence on a single crop and potentially break pest cycles, although the article focuses on technological solutions within cotton itself.

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