Concept:Cotton plants are attacked by many pests, but grain weevils prefer stored crops, not cotton fields.
Explanation:Aphids, cotton stainers, and pink bollworms feed on cotton at different stages, such as leaves, bolls, or seeds.
Weevils, especially grain weevils, commonly damage stored grains like maize and rice.
They do not attack growing cotton plants.
Thus, among the given options, the weevil is the pest that does not attack cotton.
Answer:Weevil