Detailed View of the Selection Experiment (image) University of Zurich Caption Plant populations are harmed to varying degrees by the different aphid species. From left to right shows: Population without aphids, mustard aphid, cabbage aphid, aphid mixture, mustard aphid, peach aphid. Credit picture: UZH 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.