Pink bollworm is one of the most damaging pests in cotton cultivation. It attacks the cotton bolls, feeds on the developing seeds, and affects the formation of lint. This leads to poor yield, reduced fibre quality, and financial loss for farmers. Once the larvae enter the boll, controlling them becomes very difficult. That is why early detection and timely management are important to protect the cotton crop.
The earliest signs of pink bollworm infestation include rosette flowers, where the flower does not open properly and forms a tight bud. This happens when larvae feed inside the flower. Later, as the pest develops, small holes appear in the bolls, and infected bolls fail to mature. Understanding these symptoms helps farmers act before the damage spreads.
One of the most effective ways to manage pink bollworm is through proper sowing time. Early sowing in suitable regions helps the crop escape heavy infestation because the pest population is usually lower during the early part of the season. Late sowing increases the chances of severe attack.
Farmers should also focus on field sanitation. After harvest, leftover stalks and unopened bolls may contain larvae that survive and infest the next season’s crop. Removing and destroying these residues helps break the pest cycle. Deep ploughing during summer helps expose and kill the pupae present in the soil.
Using Pheromone traps is another important method. These traps help in monitoring the pest population and also reduce the number of male moths, limiting their ability to reproduce. Farmers should place a minimum of 5–8 traps per acre for effective monitoring.
Growing resistant or tolerant varieties can also help reduce pink bollworm attack. Farmers should choose Bt cotton varieties suitable for their region. However, even Bt cotton varieties may show infestation if the pest develops resistance, so integrated management is still necessary.
Spraying insecticides should be based on monitoring and crop stage. In the early stages, sprays targeting eggs and newly hatched larvae are more effective, as older larvae hide inside the boll where chemicals cannot reach. Farmers should use recommended insecticides carefully and rotate chemicals to avoid resistance buildup.
Another eco-friendly method is releasing egg parasitoids like Trichogramma, which help control the pest population naturally. These biological agents attack the eggs of the pink bollworm, preventing them from developing into larvae.
Maintaining refuge crops is an important part of pest resistance management in Bt cotton. Refuge crops such as non-Bt cotton should be planted around the field to maintain a population of susceptible insects. This helps slow down the development of resistance in the pink bollworm population.
Balanced nutrient and water management is also essential. A healthy plant can tolerate minor damage better. Avoiding excess nitrogen prevents overly soft plant tissues that attract pests.
In simple words, managing pink bollworm in cotton requires a combination of early sowing, field sanitation, pheromone traps, resistant varieties, monitored spraying, biological control, and proper nutrient management. By using all these methods together, farmers can reduce pest attacks, protect the cotton bolls, and achieve better yield and fibre quality.
