Bollworm on Cotton Plant (image) University of Arizona Caption A bollworm, Helicoverpa zea, munches down on a cotton flower bud. This pest insect eats all parts of the cotton plant. In some places, bollworm have as many as six generations in one growing season. Credit US Department of Agriculture. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.