Black swallowwort (IMAGE) Cambridge University Press Caption Black swallowwort, like many invasive species, is difficult to manage, so various tools like herbicides need to be assessed to provide land managers effective options for their particular situation. Credit Jeromy Biazzo Usage Restrictions N/A License Original 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.