bollworm 
noun
A moth caterpillar which attacks the cotton boll, in particular:
- (pink bollworm) A small moth caterpillar which is a serious pest of the North American cotton crop (Pectinophora gossypiella, family Gelechiidae). (also cotton bollworm) another term for corn earworm.
- At the same time they had reduced pesticide applications from eight sprayings to one spraying, and the single spraying was for a secondary insect pest, not the bollworm that the cotton was now protected against.
- It would concentrate bollworms so they could be sprayed.