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Alert for Cotton Farmers: The Pink Bollworm Has Changed Its Feeding Behavior

 

“Feeding Behavior of Pink Bollworm is Changing – Now It Attacks Early and Hides in Open Flowers!” This isn't just a scientific observation; it's a critical alert for every cotton farmer, especially in North India. The old rules for managing this devastating pest no longer apply.

A comparison showing the old Pink Bollworm damage (rosette flower) vs. the new behavior of a larva inside an open cotton flower.
Changing Feeding Behavior of Pink Bollworm

To protect your crop, you need to understand how the enemy has adapted.

Pink Bollworm: Then vs. Now

For years, farmers followed a predictable pattern for Pink Bollworm (PBW) management.

  • Traditional Behavior: PBW was known to attack mid-to-late season cotton. The larvae would feed inside squares and young bolls, causing "rosette flowers"—flowers that fail to open because the petals are stuck together by the larva's webbing and frass.

  • What's Changing Now: A new and dangerous trend is emerging. The infestation is happening much earlier, just after flowering begins. The larvae are now commonly found feeding inside open flowers, often without forming the classic rosette shape. Early feeding on green bolls has also been widely reported.

Why is the Pink Bollworm Changing its Strategy?

This isn't a random occurrence. Pests adapt to survive, and several factors are likely driving this change:

  • Climate Variability: Warmer early-season temperatures can accelerate the pest's life cycle, leading to earlier infestations.

  • Bt Cotton Fatigue: Over-reliance on a single technology can lead to resistance. As some PBW populations become less susceptible to Bt cotton, their feeding dynamics with the host plant change. This is a key issue in the broader conversation about India's GM crop strategy.

  • Intense Monoculture: Large, continuous areas of cotton provide an uninterrupted food source, allowing the pest to build up its population early in the season.

  • Pest Evolution: This is a classic example of a pest evolving under management pressure. The individuals that find new ways to feed and survive are the ones that pass on their genes.

Your New Action Plan: How to Fight Back

Because the pest has changed, your management strategy must change too. Waiting for rosette flowers means you're already too late.

  1. Start Monitoring Early: Begin scouting your fields much earlier than before, around 30–45 days after sowing.

  2. Look Inside Open Flowers: Don’t just look for rosette flowers. Carefully check inside open flowers for the presence of small larvae.

  3. Use Pheromone Traps: Deploy pheromone traps right from the start to detect the first signs of moth activity. This is your earliest warning system.

  4. Take Timely Action: Once the pest is detected, take immediate action with recommended sprays or biocontrols.

  5. Practice Crop Rotation: Where possible, rotate crops and avoid sowing cotton too early to break the pest cycle.

My Perspective

From my perspective as an agricultural entomologist and in my role as Co-founder & Scientific Advisor at Agri Tej Media, this is a textbook case of pest evolution in action. It's a powerful and humbling reminder that there are no permanent "silver bullet" solutions in pest management. Relying on a single tool, whether it's a chemical or a genetic trait like Bt, will eventually fail as nature adapts. This development proves the absolute necessity of dynamic Integrated Pest Management (IPM), where farmers are vigilant observers who adapt their strategies based on what's happening in their own fields, right now.

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About the Author

Anka Pujitha Suddapalli is the Co-founder & Scientific Advisor of Agri Tej Media. As a passionate Agricultural Entomologist, her vision is to empower farmers and agricultural communities to adopt sustainable agriculture practices and integrated pest management (IPM) strategies. She is committed to advancing the science of biological control, leveraging nature's solutions to manage insect pests and promote eco-friendly agricultural practices.

Website: https://sites.google.com/view/ankapujithaentomology/

My Blog: EntoSphere by Pujitha 

Publications: https://sites.google.com/view/ankapujithaentomology/publications 

Agri Tej Media: https://www.devaharsha.in/agritej-media

Have you noticed this change in Pink Bollworm behavior in your own fields? Share your observations in the comments!

#Pujitha #PujithaEntomology #AnkaPujithaSuddapalli #AgriTej #AgriTejMedia #PinkBollworm #PBW #CottonPest #BtCotton #PestManagement #IPM #CropMonitoring #NorthIndiaAgriculture #PestAdaptation

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