Infection Cycle (IMAGE) University of California - Riverside Caption Insects (like the larva shown) that have been infested with nematodes emit an odor called prenol that repels other nematodes seeking a host. Credit UC Riverside 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.