Pink Bollworm

The Pink Bollworm (*Pectinophora gossypiella*) is one of the most destructive and economically devastating insect pests of cotton (*Gossypium*) crops worldwide, especially in cotton-growing belts of India, China, and the Americas. Belonging to the family Gelechiidae of the order Lepidoptera, this highly specialized moth pest attacks the reproductive organs of the cotton plant. The primary damage is executed by the caterpillar larvae, which chew their way into developing flower buds and cotton bolls. By feeding on the internal seeds, oil glands, and soft lint, the larvae stunt boll growth, stain fiber, and destroy the valuable commercial lint, causing severe economic ruin to cotton farmers.

Spotting a Pink Bollworm infestation early requires careful observation of floral and boll symptoms, as the pest spends its feeding life hidden inside the plant. An early diagnostic sign is the 'rosetted flower'—where the petals of cotton blossoms fail to open fully, remaining twisted, twisted, and webbed shut by the feeding larvae inside. Young larvae are tiny and cream-colored, but mature larvae grow up to 12 mm and develop highly distinctive, alternating bright pink-to-red bands on their body segments. In harvested cotton, a classic symptom is the 'double-seed'—two cotton seeds silk-lined and glued together by a larva preparing for hibernation.

The life cycle of the Pink Bollworm is optimized for hot, dry summer climates where cotton crops thrive. Female moths lay tiny, flat eggs on leaves, flower buds, or green bolls. Upon hatching, the larvae immediately bore into a boll within 20–30 minutes, making them immune to external contact insecticides. The larvae feed for 3–4 weeks before either pupating or entering a long state of dormancy (diapause) inside hollowed-out cotton seeds, enabling them to survive winters.

Managing the Pink Bollworm requires an integrated pest management (IPM) strategy because larvae are completely protected inside cotton bolls from surface chemicals. Control relies heavily on cultural practices, such as maintaining a strict 3-month 'close season' with no cotton grown to break the pest's reproductive cycle, and deep autumn plowing to expose diapausing larvae. Synthetic pheromone traps (using Gossyplure) are used to disrupt mating and monitor adult moth flights. When chemical control is necessary, apply systemic insect growth regulators or target contact synthetic pyrethroids exactly during egg-laying peak before larvae enter bolls. For detailed crop pest guides, check our Plant Disease Identifier Hub, or explore related threat profiles like Cutworms, Armyworms, and Thrips.