Which one of the following is most harmful pest (Insect) for cotton?

Pink boll worm is most harmful pest (Insect) for cotton.
Pink bollworm is one of the most destructive pests of cotton in the Punjab, Haryana and Pakistan. The damage is caused by the caterpillars only.
They are pink and are found inside flower buds, panicles and the bolls of cotton or the fruits of okra and other allied plants.