Pink bollworm

The pink bollworm (Pectinophora gossypiella) is a moth in the family Gelechiidae. It is recognized as one of the most destructive pests of cotton globally, as the larvae feed exclusively inside the cotton bolls, destroying both seeds and lint quality, which makes control efforts particularly challenging.

This insect primarily infests cultivated cotton plants, but it is also known to utilize other Malvaceae family plants as alternative hosts. Because the larvae remain hidden inside the fruit for the majority of their development, they are protected from many natural predators and standard insecticide applications.

The life cycle consists of four distinct stages: egg, larva, pupa, and adult. Female moths lay their eggs on cotton buds or flowers. Upon hatching, the larvae burrow into the boll, where they undergo multiple instar stages. Some larvae enter a state of diapause, overwintering in plant debris or soil to survive adverse conditions.

The economic damage caused by Pectinophora gossypiella is significant. Larvae consume the developing seeds, which stunts boll growth and stains the lint, often leading to secondary infections by fungi or bacteria. This results in severe yield loss and a drastic reduction in the market value of the harvested cotton.

Control strategies emphasize integrated pest management (IPM). Key tactics include mandatory host-free periods, deep plowing to destroy overwintering larvae, and the use of pheromone traps for population monitoring. Additionally, the adoption of genetically modified cotton expressing specific proteins has been an effective tool in reducing population levels in many regions.