Soybean Aphid (IMAGE) Penn State Caption Soybean aphids are a recently introduced pest to the US, causing yield losses and increased insecticide sprays. The aphids feed on the sap of soybean plants. Credit Jennifer Dean Usage Restrictions Non advertising use only 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.