Pink Bollworm

Mature larvae are distinctive: cream-coloured with pink banding that gives the pest its name, found inside bolls among the seeds. Adults are small, dark, greyish-brown moths with fringed wings. Because the larva develops inside the boll, damage is often confirmed by opening bolls and finding larvae, feeding galleries, and stained lint.

Early external signs can be subtle, such as tiny entry holes or "rosette" blooms where the flower fails to open normally. Opening suspect bolls remains the most reliable check.

Females lay eggs on or near developing bolls, and newly hatched larvae bore in to feed on seeds and lint before exiting to pupate. Multiple generations occur through a cotton season in warm climates. A key survival trait is diapause, in which larvae can remain dormant in seeds or crop debris over winter, re-emerging when conditions favour a new crop.

This overwintering ability, combined with the concealed feeding habit, is why sanitation and area-wide timing of the cotton crop are so important in reducing carry-over populations.

Larval feeding destroys seeds and cuts and stains lint, reducing both the quantity and quality of the harvested fibre, and feeding wounds can admit boll-rotting organisms. Because damage is internal, it can be extensive before it is obvious, so monitoring and preventive strategies are emphasized over reactive treatment.

Cotton is the primary host. The pest’s close association with cotton bolls is central to both the damage it causes and the area-wide strategies used against it.

Pheromone traps are widely used to detect adult activity and time management, and boll sampling — opening bolls to check for larvae and internal damage — assesses infestation directly. In area-wide programmes, coordinated trapping and reporting across many farms guide regional decisions.

Pink bollworm is best managed through coordinated, preventive, area-wide strategies within integrated pest management rather than by individual reactive spraying.

• Practise strict field sanitation, including destroying crop residues and stalks to reduce overwintering larvae
• Use uniform planting and harvest timing across an area to shorten the host window
• Employ mating disruption with pheromones where available to suppress reproduction
• Use biotech cotton and, in some programmes, sterile-insect releases as part of coordinated management
• Support area-wide monitoring and resistance management across farms