Callose Production (IMAGE) Max Planck Institute for Chemical Ecology Caption When wheat is attacked by aphids, the plant produces a less toxic form of benzoxazinoids, which regulates callose production. Callose makes it difficult for aphids to take up plant sap. Credit Beibei Li and Tobias Züst / University of Bern, Switzerland 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.