Fruit Signaling (IMAGE) Canale Communications Caption The fruit of the virescens oil palm changes from yellow-green when unripe to bright orange when ripe, signaling the optimal time for harvesting and oil yield. Credit Nature Communications 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.