New Romaine Lettuce Lines Launched (IMAGE) American Society for Horticultural Science Caption SM09A, one of two new romaine lettuce breeding lines found to be resistant to dieback disease, also showed good shelf life. Credit Photo by Ivan Simko. 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.