Willow without Protective Treatment (IMAGE) University of Washington Caption Willow cuttings without the treatment ceased growing, lost leaves and died when grown in solution with phenanthrene. Credit Sharon Doty Lab/U of Washington Usage Restrictions Credit required 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.