Hessian Fly Larvae (IMAGE) Purdue University Caption After Hessian fly larvae hatch on the leaves of wheat plants, they crawl down the stem to the base of the plant where they eat. As they feed, the insects inject chemical-filled saliva into the wheat that can destroy the crop. Credit Electron micrograph photo/Subhashree Subramanyam, Mary Alice Web and Christie Williams Usage Restrictions None License Licensed content 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.